#include <stdio.h>
int main(){
  int n,x,y;
  scanf("%d%d%d",&n,&x,&y);
  if(x!=0)
      if(y%x==0){
        printf("%d",n-(y/x));
      }else{
        printf("%d",n-(y/x+1));
      }
    else
        printf("%d",n);
  return 0;
}