This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int INF = 1e6+7;
signed main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
int t=1,n,a,ans;
// cin >> t;
while (t--){
cin >> n;
ans = 0;
for (int i = 0; i < n; i++){
cin >> a;
a--;
// cout << (a*())
ans = ((ans+(((a)*(n-i))%INF))%INF);
}
ans = ((ans+1)%INF);
cout << ans << "\n";
}
return 0;
}
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