#include <bits/stdc++.h>
using namespace std;
int n,x,y,ans;
int main(){
	scanf("%d%d%d",&n,&x,&y);
	if(!x)printf("0");
	if(y/x>n){
		printf("0");return 0;
	}
	y%x?ans = n-y/x-1:ans = n-y/x;
	printf("%d",ans);
	return 0;
}