#include<bits/stdc++.h>
using lint=long long;
using real=long double;
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    lint p,q,a;std::cin>>p>>q>>a;
    if(p<=q){
        std::cout<<(p==q&&a?1'000'000'000:0)<<'\n';
        return 0;
    }
    lint l=((a+p-q-1)/(p-q)-1)*100;
    lint ans=l;
    for(lint i=l+1;i<l+100;i++){
        ans+=p*i/100<q*i/100+a;
    }
    std::cout<<ans<<'\n';
}