#include<bits/stdc++.h>
using namespace std;
int main(){
	int m,t,s;
	cin>>m>>t>>s;
	int ans;
	if(t==0){
		cout<<m;
		return 0;
	}else{
	if(s%t==0){
		cout<<max(m-s/t,0);
	}else{
		cout<<max(m-s/t-1,0);
	}
	}
}