1056 组合数的和 (15 分)

#include<stdio.h>

int main()
{
    int N;
    scanf("%d", &N);

    int i, sum=0, num;
    for(i=0; i<N; i++)
    {
        scanf("%d", &num);
        sum += num;
    }
    printf("%d", sum*11*(N-1));
}