#include <bits/stdc++.h>

using namespace std;
#define int long long
const int p=998244353;
int po(int a,int b) {if(b==0) return 1; if(b==1) return a; if(b%2==0) {int u=po(a,b/2);return (u*1LL*u)%p;} else {int u=po(a,b-1);return (a*1LL*u)%p;}}
int inv(int x) {return po(x,p-2);}
mt19937 rnd;
#define app push_back
#define all(x) (x).begin(),(x).end()
#ifdef LOCAL
#define debug(...) [](auto...a){ ((cout << a << ' '), ...) << endl;}(#__VA_ARGS__, ":", __VA_ARGS__)
#define debugv(v) do {cout<< #v <<" : {"; for(int izxc=0;izxc<v.size();++izxc) {cout << v[izxc];if(izxc+1!=v.size()) cout << ","; }cout <<"}"<< endl;} while(0)
#else
#define debug(...)
#define debugv(v)
#endif
#define lob(a,x) lower_bound(all(a),x)
#define upb(a,x) upper_bound(all(a),x)
const int inf=1e18;
const int maxn=1e3+5;
vector<array<int,3> > v;
bool ok[maxn];
int dp[maxn];
int32_t main()
{
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int n,m,q;cin>>n>>m>>q;
    for(int i=0;i<m;++i)
    {
        int x,y,w;cin>>x>>y>>w;--x;--y;
        v.app({x,y,w});
    }
    for(int i=0;i<m;++i) {ok[i]=1;}
    for(int i=0;i<q;++i)
    {
        int id;cin>>id;--id;ok[id]^=1;
        fill(dp,dp+maxn,-inf);
        dp[0]=0;
        while(true)
        {
            bool okk=false;
            for(int j=0;j<m;++j)
            {
                if(ok[j])
                {
                    auto h=v[j];
                    if(dp[h[1]]<dp[h[0]]+h[2])
                    {
                        dp[h[1]]=dp[h[0]]+h[2];
                        okk=true;
                    }
                }
            }
            if(!okk) {break;}
        }
        if(dp[n-1]<-1e12)
        {
            cout<<"NaN"<<'\n';
        }
        else
        {
            cout<<dp[n-1]<<'\n';
        }
    }
    return 0;
}