// #define DEBUGGING
#include <bits/stdc++.h>
#define endl '\n'
#define ALL(V) (V).begin(), (V).end()
#define ALLR(V) (V).rbegin(), (V).rend()
template <typename T> using V = std::vector<T>;
template <typename T> using VV = V<V<T>>;
using ll = std::int64_t;
using ull = std::uint64_t;
using PLL = std::pair<ll, ll>;
using TLL = std::tuple<ll, ll, ll>;
template <typename T> const T& var_min(const T &t) { return t; }
template <typename T> const T& var_max(const T &t) { return t; }
template <typename T, typename... Tail> const T& var_min(const T &t, const Tail&... tail) { return std::min(t, var_min(tail...)); }
template <typename T, typename... Tail> const T& var_max(const T &t, const Tail&... tail) { return std::max(t, var_max(tail...)); }
template <typename T, typename... Tail> void chmin(T &t, const Tail&... tail) { t = var_min(t, tail...); }
template <typename T, typename... Tail> void chmax(T &t, const Tail&... tail) { t = var_max(t, tail...); }
template <typename T> const T& clamp(const T &t, const T &low, const T &high) { return std::max(low, std::min(high, t)); }
template <typename T> void chclamp(T &t, const T &low, const T &high) { return t = clamp(t, low, high); }
namespace init__ { struct InitIO { InitIO() { std::cin.tie(nullptr); std::ios_base::sync_with_stdio(false); std::cout << std::fixed << std::setprecision(30); } } init_io; }
#define mv_rec make_v(init, tail...)
template <typename T> T make_v(T init) { return init; }
template <typename T, typename... Tail> auto make_v(T init, size_t s, Tail... tail) { return V<decltype(mv_rec)>(s, mv_rec); }
#undef mv_rec
#ifdef DEBUGGING
#include "../../debug/debug.cpp"
#else
#define DEBUG(...) 0
#define DEBUG_SEPARATOR_LINE 0
#endif
using namespace std;

ll solve() {
    ll P, Q, A;
    cin >> P >> Q >> A;

    auto calc = [&](ll cost, ll tax) { return cost + cost * tax / 100; };
    auto check = [&](ll cost) { return calc(cost, P) < calc(cost, Q) + A; };
    ll ans = 0;

    if(P < Q) return 1e9;
    
    for(ll mod = 0; mod < 100; mod++) {
        ll ok_m = !mod;
        ll init_ok = ok_m;
        ll ng_m = 1e9 / 100 + !mod;
        if(!check(ok_m * 100 + mod)) continue;
        while(ng_m - ok_m > 1) {
            ll mid = (ok_m + ng_m) / 2;
            (check(mid * 100 + mod) ? ok_m : ng_m) = mid;
        }
        ans += ok_m - init_ok + 1;
    }
    return ans;
}

int main() {
    cout << solve() << endl;
    return 0;
}