#c 第四个点怎么回事啊

#include "stdio.h"
int main()
{
    int m,t,s;
    scanf("%d %d %d",&m,&t,&s);
    if(t==0){
    printf("%d",m);
    return 0;
    }
   
    if(s==0)
    printf("%d",m);
    
    if(s%t==0)
    printf("%d",m-s/t);
    
    else if((m-s/t-1)<=0)
     printf("0");
     else
    printf("%d",(m-s/t-1));
    return 0;
    
}