#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;
    lint inf=1'000'000'000;
    lint l=p<=q?(p<q||0<a?inf:0):(a==0?0:(a-1)/(p-q)*100);
    lint ans=l;
    for(lint i=l+1;i<=std::min(inf,l+99);i++){
        ans+=p*i/100<q*i/100+a;
    }
    std::cout<<ans<<'\n';
}