#include using namespace std; using ll = long long; int main() { ios::sync_with_stdio(false), cin.tie(0); int P, Q, A; cin >> P >> Q >> A; const ll MAX = 1e9 + 1; ll lb = 0, ub = MAX; while (ub - lb > 1) { ll m = (lb + ub) / 2; if ((100 + Q) * m / 100 + A <= (100 + P) * m / 100) { ub = m; } else { lb = m; } } int res = lb; for (ll i = max(1LL, lb - 200); i < min(lb + 201, MAX); i++) { if ((100 + Q) * i / 100 + A > (100 + P) * i / 100) { res += i > lb; } else { res -= i <= lb; } } cout << res << endl; return 0; }