编辑代码

#include<stdio.h>   
int fun(int i);  
int main()  
{  
    int s=0, a, b, c;  
    scanf("%d",&a);
    scanf("%d",&b);
    scanf("%d",&c);  
    s=fun(a)+fun(b)+fun(c);
    printf("%d",s);
    return 0;
}   
int fun(int i)  
{  
    int n = 1;  
    int s = 1;  
    while(n <= i)
    {  
        s *= n;  
        n += 1;  
    }  
    return s;
}