#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int main() {
    ll p,q,a;
    cin >> p >> q >> a;

    int ans = 0;

    if(p <= q && a > 0){
        cout << 1000000000 << endl;
        return 0;
    }
    if(p < q){
        cout << 1000000000 << endl;
        return 0;
    }

    double pp = (100.0 + p) / 100;
    double qq = (100.0 + q) / 100;

    srep(i,1,20000000){
        ll ii = i;
        ll x = ii + ii * p / 100;
        ll y = ii + ii * q / 100 + a;
        if(x < y)ans++;
    }

    cout << ans << endl;
    return 0;
}