using Lib;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using static Lib.OutputLib;
public class Solver
{
    const bool MultiTestCase = false;
    void Solve()
    {
        int n = ri;
        var g = new ProjectSelectionProblem(INF);
        var x = new int[n];
        for (int i = 0; i < n; i++) x[i] = g.AddProject();

        for (int i = 0; i < n; i++)
        {
            int p = ri;
            if (p > 0) g.Gain1(x[i], p);
            if (p < 0) g.Lose1(x[i], -p);
        }
        int m = ri;
        for (int i = 0; i < m; i++)
        {
            int u = ri - 1, v = ri - 1;
            g.Ban01(x[u], x[v]);
        }
        int k = ri;
        for (int i = 0; i < k; i++)
        {
            int a = ri - 1, b = ri - 1, s = ri;
            g.Gain11(x[a], x[b], s);
        }
        Write(g.Calc());
    }


#pragma warning disable CS0162, CS8618
    public Solver() { if (!MultiTestCase) Solve(); else for (int t = ri; t > 0; t--) Solve(); }
#pragma warning restore CS0162, CS8618

    const int IINF = 1 << 30;
    const long INF = 1L << 60;
    int ri { [MethodImpl(256)] get => (int)sc.Integer(); }
    long rl { [MethodImpl(256)] get => sc.Integer(); }
    uint rui { [MethodImpl(256)] get => (uint)sc.UInteger(); }
    ulong rul { [MethodImpl(256)] get => sc.UInteger(); }
    double rd { [MethodImpl(256)] get => sc.Double(); }
    string rs { [MethodImpl(256)] get => sc.Scan(); }
    string rline { [MethodImpl(256)] get => sc.Line(); }
    public StreamScanner sc = new StreamScanner(Console.OpenStandardInput());
    void ReadArray(out int[] a, int n) { a = new int[n]; for (int i = 0; i < a.Length; i++) a[i] = ri; }
    void ReadArray(out long[] a, int n) { a = new long[n]; for (int i = 0; i < a.Length; i++) a[i] = rl; }
    void ReadArray<T>(out T[] a, int n, Func<T> read) { a = new T[n]; for (int i = 0; i < a.Length; i++) a[i] = read(); }
    void ReadArray<T>(out T[] a, int n, Func<int, T> read) { a = new T[n]; for (int i = 0; i < a.Length; i++) a[i] = read(i); }
}

static class Program
{
    static public void Main(string[] args)
    {
        SourceExpander.Expander.Expand();
        Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
        new Solver();
        Console.Out.Flush();
    }

}
#region Expanded by https://github.com/kzrnm/SourceExpander
public class MaxFlow{public class Edge{public int to,rev;public long cap;}readonly int n;public List<Edge>[]g;public MaxFlow(int _n){n=_n;g=new List<Edge>[n];for(int i=0;i<n;i++)g[i]=new List<Edge>();}public void AddEdge(int from,int to,long cap){g[from].Add(new Edge{to=to,cap=cap,rev=g[to].Count});g[to].Add(new Edge{to=from,cap=0,rev=g[from].Count-1});}private void BFS(int s,int t){Array.Fill(level,-1);level[s]=0;var que=new Queue<int>();que.Enqueue(s);while(que.Count>0){int v=que.Dequeue();for(int i=0;i<g[v].Count;i++){var e=g[v][i];if(e.cap==0||level[e.to]>=0)continue;level[e.to]=level[v]+1;if(e.to==t)return;que.Enqueue(e.to);}}}private long DFS(int s,int v,long up){if(v==s)return up;long res=0;int level_v=level[v];for(;iter[v]<g[v].Count;iter[v]++){int i=iter[v];var e=g[v][i];if(level_v<=level[e.to]||g[e.to][e.rev].cap==0)continue;long d=DFS(s,e.to,Math.Min(up-res,g[e.to][e.rev].cap));if(d<=0)continue;g[v][i].cap+=d;g[e.to][e.rev].cap-=d;res+=d;if(res==up)return res;}level[v]=n;return res;}int[]level,iter;public long Calc(int s,int t,long flow_limit=-1){if(flow_limit<0)flow_limit=1L<<60;level=new int[n];iter=new int[n];long flow=0;while(flow<flow_limit){BFS(s,t);if(level[t]==-1)break;Array.Fill(iter,0);var f=DFS(s,t,flow_limit-flow);if(f==0)break;flow+=f;}return flow;}public bool[]MinCut(int s){var visited=new bool[n];var qu=new Queue<int>();qu.Enqueue(s);while(qu.Count>0){var x=qu.Dequeue();visited[x]=true;for(int i=0;i<g[x].Count;i++){var e=g[x][i];if(e.cap>0&&!visited[e.to]){visited[e.to]=true;qu.Enqueue(e.to);}}}return visited;}}
public class ProjectSelectionProblem{int n;List<(int from,int to,long cap)>edges;long sum,INF;public ProjectSelectionProblem(long inf){n=2;edges=new List<(int from,int to,long cap)>();sum=0;INF=inf;}public int AddProject()=>n++;public void Ban0(int x)=>edges.Add((x,1,INF));public void Lose0(int x,long w)=>edges.Add((x,1,w));public void Gain0(int x,long w){sum+=w;edges.Add((0,x,w));}public void Ban1(int x)=>edges.Add((0,x,INF));public void Lose1(int x,long w)=>edges.Add((0,x,w));public void Gain1(int x,long w){sum+=w;edges.Add((x,1,w));}public void Ban01(int x,int y)=>edges.Add((x,y,INF));public void Lose01(int x,int y,long w)=>edges.Add((x,y,w));public void GainSame(int x,int y,long w){sum+=w;edges.Add((x,y,w));edges.Add((y,x,w));}public void LoseDiff(int x,int y,long w){edges.Add((x,y,w));edges.Add((y,x,w));}public void BanDiff(int x,int y){edges.Add((x,y,INF));edges.Add((y,x,INF));}public void Gain00(int x,int y,long w){sum+=w;int z=AddProject();edges.Add((0,z,w));edges.Add((z,x,INF));edges.Add((z,y,INF));}public void Gain11(int x,int y,long w){sum+=w;int z=AddProject();edges.Add((z,1,w));edges.Add((x,z,INF));edges.Add((y,z,INF));}public void GainAll0(ReadOnlySpan<int>v,long w){sum+=w;int y=AddProject();edges.Add((0,y,w));foreach(var x in v)edges.Add((y,x,INF));}public void GainAll1(ReadOnlySpan<int>v,long w){sum+=w;int y=AddProject();edges.Add((y,1,w));foreach(var x in v)edges.Add((x,y,INF));}public long Calc(){var mf=new MaxFlow(n);foreach(var(from,to,cap)in edges)mf.AddEdge(from,to,cap);return sum-mf.Calc(0,1);}}
namespace Lib{public partial class StreamScanner{public StreamScanner(Stream stream){str=stream;}private readonly Stream str;private readonly byte[]buf=new byte[1024];private int len,ptr;public bool isEof=false;public bool IsEndOfStream{get{return isEof;}}[MethodImpl(256)]private byte Read(){if(isEof)throw new EndOfStreamException();if(ptr>=len){ptr=0;if((len=str.Read(buf,0,1024))<=0){isEof=true;return 0;}}return buf[ptr++];}[MethodImpl(256)]public char Char(){byte b;do b=Read();while(b<33||126<b);return(char)b;}[MethodImpl(256)]public string Line(){var sb=new StringBuilder();for(var b=Char();b!=10&&!isEof;b=(char)Read())sb.Append(b);return sb.ToString();}[MethodImpl(256)]public string Scan(){var sb=new StringBuilder();for(var b=Char();b>=33&&b<=126;b=(char)Read())sb.Append(b);return sb.ToString();}[MethodImpl(256)]public long Integer(){long ret=0;var ng=false;byte b;do b=Read();while(b!='-'&&(b<'0'||'9'<b));if(b=='-'){ng=true;b=Read();}for(;'0'<=b&&b<='9';b=Read())ret=ret*10+(b^'0');return ng?-ret:ret;}[MethodImpl(256)]public ulong UInteger(){ulong ret=0;byte b;do b=Read();while(b<'0'||'9'<b);for(;'0'<=b&&b<='9';b=Read())ret=ret*10+(ulong)(b^'0');return ret;}[MethodImpl(256)]public double Double()=>double.Parse(Scan());}}
namespace Lib{public static class OutputLib{[MethodImpl(256)]public static void WriteJoin<T>(string s,IEnumerable<T>t)=>Console.WriteLine(string.Join(s,t));[MethodImpl(256)]public static void WriteMat<T>(T[,]a,string sep=" "){int sz1=a.GetLength(0),sz2=a.GetLength(1);var b=new T[sz2];for(int i=0;i<sz1;i++){for(int j=0;j<sz2;j++)b[j]=a[i,j];WriteJoin(sep,b);}}[MethodImpl(256)]public static void WriteMat<T>(T[][]a,string sep=" "){foreach(var ar in a)WriteJoin(sep,ar);}[MethodImpl(256)]public static void WriteMat<T>(T[][]a,Func<T,string>map,string sep=" "){foreach(var ar in a)WriteJoin(sep,ar.Select(x=>map(x)));}[MethodImpl(256)]public static void Write(object t)=>Console.WriteLine(t.ToString());[MethodImpl(256)]public static void Write(params object[]arg)=>Console.WriteLine(string.Join(" ",arg.Select(x=>x.ToString())));[MethodImpl(256)]public static void Write(string str)=>Console.WriteLine(str);[MethodImpl(256)]public static void WriteFlush(object t){Console.WriteLine(t.ToString());Console.Out.Flush();}[MethodImpl(256)]public static void WriteError(object t)=>Console.Error.WriteLine(t.ToString());[MethodImpl(256)]public static void Flush()=>Console.Out.Flush();[MethodImpl(256)]public static void YN(bool t)=>Console.WriteLine(t?"YES":"NO");[MethodImpl(256)]public static void Yn(bool t)=>Console.WriteLine(t?"Yes":"No");[MethodImpl(256)]public static void yn(bool t)=>Console.WriteLine(t?"yes":"no");[MethodImpl(256)]public static void DeleteLine()=>Console.Write("\x1b[1A\x1b[2K");[MethodImpl(256)]public static void ProgressBar(long now,long total,int blocks=50){int x=(int)((2*now*blocks+1)/(2*total));Console.Write($"\x1b[G[\x1b[42m{string.Concat(Enumerable.Repeat("_",x))}\x1b[0m{string.Concat(Enumerable.Repeat("_",blocks-x))}] : {now} / {total}");}}}
namespace SourceExpander{public class Expander{[Conditional("EXP")]public static void Expand(string inputFilePath=null,string outputFilePath=null,bool ignoreAnyError=true){}public static string ExpandString(string inputFilePath=null,bool ignoreAnyError=true){return "";}}}
#endregion Expanded by https://github.com/kzrnm/SourceExpander