#include<bits/stdc++.h>
#define REP(i,n) for(int i=0,i##_len=(n);i<i##_len;++i)
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
#define All(x) (x).begin(),(x).end()
using namespace std;
using ll = long long;

int main(){
    ll P,Q,A;
    cin>>P>>Q>>A;
    if(P<Q&&A>0){
        cout<<(int)1e9<<endl;
        return 0;
    }else if(P==Q&&A>0){
        cout<<(int)1e9<<endl;
        return 0;
    }else if(P==Q&&A==0){
        cout<<0<<endl;
        return 0;
    }
    ll l=-1,r=1e9+1;
    while(l+1<r){
        ll x=(l+r)/2;
        if((P*x)/100<(Q*x)/100+A+1) l=x;
        else r=x;
    }
    ll ln=0,rn=1e9+1;
    while(ln+1<rn){
        ll m=(ln+rn)/2;
        if(P*m/100<Q*m/100+A-1) ln=m;
        else rn=m;
    }
    ll rem=0;
    rep(i,ln,l+1){
        if(P*i/100<Q*i/100+A) rem++;
    }
    cout<<ln+rem-1<<endl;
}