#include<iostream>
using namespace std;
int main() 
{
	int m,t,s;
	cin>>m>>t>>s;
	if (t==0){
		cout << 0;
	}
	else if (m-(s/t)<0){
		cout << 0;
	}
    else if (s%t==0){
    	cout << m-(s/t);
	}
	else{
		cout << m-(s/t)-1;
	}
    return 0;
}