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