百鸡问题 

#include<stdio.h>
int main(){int n;scanf("%d",&n);int x,y,z;for(x=0;x<=100;x++){for(y=0;y<=100;y++){for(z=0;z<=100;z++){if((x*15+y*9+z)<=(3*n) && ((x+y+z)==100)){printf("x=%d,y=%d,z=%d\n",x,y,z);}}}}return 0;
}