#include<stdio.h>
#include<iostream>
using namespace std;
int main()
{
	int n,t,s,count=0,q;
	cin>>n>>t>>s;
	for(int i=1;i<=1000;i++)
	{
		int x=i*t;
		if(x<s)
		{
		count++;	
		}
		q=s-x;
		if(q<=t)
		{
		count++;
		break;	
		}
	}
	if(n-count>0)
	{
		cout<<n-count;
	}else{
		cout<<0;
	}
	return 0;
}
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