#include<bits/stdc++.h> 

using namespace std;

int main()

{
    int a,b,c;
    
    cin>>a>>b>>c;
    
    if(b==0)
    
    {
        cout<<100<<endl;
        
        return 0;
        
    }
    int e=ceil((double)c/b);
    
    cout<<max(a-e,0)<<endl;
    
    return 0;
    
}