import java.io.*;
import java.util.*;
import java.math.*;
// import java.awt.Point;
 
public class Main {
    InputStream is;
    PrintWriter out;
    String INPUT = "";
 
    long MOD = 1_000_000_007;
    int inf = Integer.MAX_VALUE;

    void solve(){
        int n = ni();
        int m = ni();
        int k = ni();
        int s = ni();
        int t = ni();
        if(m==0){
            if(n==1){
                out.println(Math.abs(s-t));
                return;
            }
            out.println(-1);
            return;
        }
        int[][] root = new int[m][3];
        for(int i = 0; i < m; i++){
            root[i]= new int[]{ni()-1, ni(), ni()};
        }
        Arrays.sort(root, new Comparator<int[]>() {
            public int compare(int[] a, int[] b) {
                if(a[0]==b[0]) return a[2]-b[2];
                return a[0] - b[0];
            }
        });
        int a = 0;
        int z = 0;
        // ArrayList<long[]>arrp = new ArrayList<>();
        HashMap<Integer, Long> mapp = new HashMap<>();
        for(int v = 0; v < n-1; v++){
            HashMap<Integer, Long> map = new HashMap<>();
            if(root[z][0]!=a){
                out.println(-1);
                return;
            }
            long prev = inf;
            while(root[z][0]==a){
                long res = Long.MAX_VALUE;
                if(a==0){
                    res = Math.abs(s-root[z][1]);
                }
                for(int y : mapp.keySet()){
                    res = Math.min(Math.abs(root[z][1]-y)+mapp.get(y), res);
                }
                if(map.getOrDefault(root[z][2], -1l)!=-1l){
                    res = Math.min(res, map.get(root[z][2]));
                }
                map.put(root[z][2], res);
                prev = root[z][2];
                z++;
                if(z>=m) break;
            }
            mapp = map;
            // for(long[] x : arrp){
            //     out.println(x[0]+" "+x[1]);
            // }
            a++;
            if(a>=n-1) break;
        }
        long ans = Long.MAX_VALUE;
        for(int x : mapp.keySet()){
            // out.println(x[0]+" "+x[1]);
            ans = Math.min(ans, Math.abs(t-x)+mapp.get(x));
        }
        out.println(ans);
    }

    
    void run() throws Exception
    {
        is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
        out = new PrintWriter(System.out);
        
        long s = System.currentTimeMillis();
        solve();
        out.flush();
        if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
    }
    
    public static void main(String[] args) throws Exception { new Main().run(); }
    
    private byte[] inbuf = new byte[1024];
    private int lenbuf = 0, ptrbuf = 0;
    
    private int readByte()
    {
        if(lenbuf == -1)throw new InputMismatchException();
        if(ptrbuf >= lenbuf){
            ptrbuf = 0;
            try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
            if(lenbuf <= 0)return -1;
        }
        return inbuf[ptrbuf++];
    }
    
    private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
    private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
    
    private double nd() { return Double.parseDouble(ns()); }
    private char nc() { return (char)skip(); }
    
    private String ns()
    {
        int b = skip();
        StringBuilder sb = new StringBuilder();
        while(!(isSpaceChar(b) && b != ' ')){
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    
    private char[] ns(int n)
    {
        char[] buf = new char[n];
        int b = skip(), p = 0;
        while(p < n && !(isSpaceChar(b))){
            buf[p++] = (char)b;
            b = readByte();
        }
        return n == p ? buf : Arrays.copyOf(buf, p);
    }
    
    private char[][] nm(int n, int m)
    {
        char[][] map = new char[n][];
        for(int i = 0;i < n;i++)map[i] = ns(m);
        return map;
    }
    
    private int[] na(int n)
    {
        int[] a = new int[n];
        for(int i = 0;i < n;i++)a[i] = ni();
        return a;
    }
    
    private int ni()
    {
        int num = 0, b;
        boolean minus = false;
        while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
        if(b == '-'){
            minus = true;
            b = readByte();
        }
        
        while(true){
            if(b >= '0' && b <= '9'){
                num = num * 10 + (b - '0');
            }else{
                return minus ? -num : num;
            }
            b = readByte();
        }
    }
    
    private long nl()
    {
        long num = 0;
        int b;
        boolean minus = false;
        while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
        if(b == '-'){
            minus = true;
            b = readByte();
        }
        
        while(true){
            if(b >= '0' && b <= '9'){
                num = num * 10 + (b - '0');
            }else{
                return minus ? -num : num;
            }
            b = readByte();
        }
    }
    
    private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
 
}