hdu 5430(几何)

#include <iostream>
#include <cstring>
#include <cstdio>

using namespace std;

int gcd(int x,int y)
{
    if(x%y != 0)
        return gcd(y,x%y);
    return y;
}

int main()
{
    int T,n;
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d",&n);
        int ans = 0;
        for(int i = 1;i <= n;i++)
        {
            if(gcd(n+1,i) == 1)
                ans ++;
        }
        printf("%d\n",ans);
    }
    return 0;
}