#include "bits/stdc++.h"
#define REP(i, n) for(int i = 0; i < int(n); i++)
#define FOR(i,n,m) for(int i = int(n); i < int(m); i++)
using namespace std;
typedef long long ll;
const int MOD = 1e9 + 7;
const int INF = 1e9 + 6;
const ll LLINF = 1e18 + 1;

int p, q, a;

bool f(int mid) {
    int b = (int)((1 + p / 100.0)*mid);
    int c = (int)((1 + q / 100.0)*mid) + a;
    return c > b;
}

int main() {
    cin >> p >> q >> a;
    if (p <= q) {
        puts("1000000000");
        return 0;
    }    
    int ans = int((a - 1)*100.0 / (p - q));
    int k = int((a + 1) * 100.0 / (p - q));
    for (int i = ans + 1; i <= k; i++) {
        if (f(i)) ans++;
    }
    cout << ans << endl;
    return 0;
}