#include<bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int main() {
    ULL p, q, a; cin >> p >> q >> a;
    p += 100; q += 100;

    ULL l = 0, r = 1000000001;
    while (l + 1 < r) {
        ULL m = (l + r) / 2;
        if (m * p / 100 < m * q / 100 + a) l = m;
        else r = m;
    }

    ULL ans = l - 1 - min(l - 1, 399ull);
    for (ULL i = l - min(l - 1, 399ull); i < r + 400; i++) {
        if (i * p / 100 < i * q / 100 + a) ans++;
    }

    cout << ans << endl;

    return 0;
}