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#include <iostream>
#include <fstream>
#define Pinfinit 9
using namespace std;
fstream f("ubuntzei.in", ios::in);
fstream g("ubuntzei.out", ios::out);
struct muchie{int e1, e2, c;}muchia[10000],aux,sol[10000];
int i,m,n,j,a[10000][10000],k,oras[10000];
void citire()
{
f>>n>>m>>k;
for(i=1; i<=k; i++)
f>>oras[i];
for(i=1;i<=m;i++)
f>>muchia[i].e1>>muchia[i].e2>>muchia[i].c;
f.close();
}
void matad()
{
for(i=1; i<=n; i++)
for(j=1;j<=n;j++)
a[i][j]=Pinfinit;
for(i=1;i<=m;i++)
a[muchia[i].e1][muchia[i].e2] = muchia[i].c;
}
void prel_20p()
{
for(k=1;k<=n;k++)
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
if(a[i][j] > a[i][k] + a[k][j] && i!=j && i!=k)
a[i][j] = a[i][k] + a[k][j];
g<<a[1][n];
}
int main()
{
citire();
matad();
prel_20p();
return 0;
}