#include<bits/stdc++.h>
using namespace std;
#define int long long
vector<vector<pair<int ,int>>> g;
signed main(){
int n ,m;
cin>>n>>m;
vector<int> a(n + 1);
for(int i =1;i<=n;i++)cin>>a[i];
g.resize(n+1);
vector<pair<int , int>> edge(m);
int ans=0;
for(int i =0;i<m;i++){
int u,v , c;
cin>>u>>v;
c = max(1LL , abs(a[u] - a[v]));
g[u].push_back({v , c});
g[v].push_back({u , c});
edge[i] = {u , v};
}
sort(edge.begin() , edge.end());
for(int i = 0 ; i < m;i++){
int u = edge[i].first , v = edge[i].second;
int c = max(1LL , abs(a[u] - a[v]));
// cout << u << " " << v << " " << c << "\n";
ans += c;
}
cout<<ans;
}
