codeforecs Fox and Number Game

题目链接:http://codeforces.com/problemset/problem/389/A

非常简单的一题，也非常蛋疼的一题。

#include<stdio.h>int GCD(int a, int b){return b==0? a : GCD(b, a%b);}int main(){int n, x, y, i;scanf("%d%d", &n, &x);for(i=1;i<n;i++)    {scanf("%d", &y);x=GCD(x,y);    }printf("%d", x*n);return 0;}