#include <bits/stdc++.h>
using namespace std::literals::string_literals;
using i64 = std::int_fast64_t;
using std::cout;
using std::cerr;
using std::endl;
using std::cin;

template<typename T>
std::vector<T> make_v(size_t a){return std::vector<T>(a);}

template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts){
  return std::vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}

int main() {
	i64 x, y, h; scanf("%lld%lld%lld", &x, &y, &h);
	x *= 1000; y *= 1000;

	auto dp = make_v<bool>(32, 32); dp[0][0] = true;
	for(int i = 0; i < 32; i++) {
		for(int j = 0; j < 32; j++) {
			if(!dp[i][j]) continue;
			
			i64 H = h << (i + j);
			i64 X = x >> i, Y = y >> j;
			if(X >= H) dp[i + 1][j] = true;
			if(Y >= H) dp[i][j + 1] = true;
		}
	}

	int ans = 0;
	for(int i = 0; i < 32; i++) for(int j = 0; j < 32; j++) if(dp[i][j]) ans = std::max(ans, i + j);
	printf("%d\n", ans);
	return 0;
}