codeforce - Wizards and Demonstration

#include<bits/stdc++.h>
using namespace std;
#define fastread()(ios_base::sync_with_stdio(false),cin.tie(NULL));
int main()
{
    int a,b,c;
    fastread();
    cin>>a>>b>>c;
    double x= (double)c*(double)a/100;
    int ans= ceil(x);
    if(ans>b)ans-=b;
    else ans=0;
    cout<<ans<<endl;
    return 0;
}