#include<stdio.h>
int main()
{
    int n,a,b,c,d,i,t=0;
    scanf("%d",&n);
    if(n==0)
        printf("0\n");
    if(n>0)
    {
        for(i=1;i<=n;i++)
        {
            a=i%5;
            b=i%25;
            c=i%125;
            d=i%625;
            if(a==0&&b!=0&&c!=0&&d!=0)
                t=t+1;
            if(a==0&&b==0&&c!=0&&d!=0)
                t=t+2;
            if(a==0&&b==0&&c==0&&d!=0)
                t=t+3;   
            if(a==0&&b==0&&c==0&&d==0)
                t=t+4;
        }
        printf("%d\n",t);
    }
    return 0;
}
            

恩!你的这个程序很好！呵呵，但是有部分不懂，运行也没有错，希望可以讲解一下！谢谢