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