#include<iostream>
using namespace std;
int main()
{
int n,x,y,leap,z;
cin>>n>>x>>y;
if(y%x==0)
leap=0;
else
leap=1;
z=n-y/x-leap;
cout<<z<<endl;
return 0;
}

#include<iostream>
#include<cmath>
using namespace std;
int main()
{
int n,x;
double y;
cin>>n>>x>>y;
cout<<n-ceil(y/x);
return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,x,y;
    cin>>n>>x>>y;
    cout<<n-ceil(y*1.0/x);
    return 0;
}