#include <iostream>
#include <cstdio>

using namespace std;

int T;

int main() {
    freopen("twoton.in", "r", stdin);
    freopen("twoton.out", "w", stdout);

    scanf("%d", &T);

    long long sol = 0;
    int m = 100001;
    while(T--) {
        int x;
        scanf("%d", &x);

        if(x < m) m = x;
        sol+=m;
    }

    printf("%lld\n", sol);

    return 0;
}