#include "bits/stdc++.h"

//#include <atcoder/all>

using namespace std;
//using namespace atcoder;

//#define int long long
#define ll long long

ll INF = (1LL << 60);
int mod = 1000000007;
using P = pair<int, int>;

signed main() {
	int a, b; cin >> a >> b; 
	// 短針 - 長針
	int kakudo = (a * 60)%720 + (b *1)%720 - (b * 12)%720;
	if (kakudo < 0)kakudo += 720;
	cout << kakudo * 600 / 110  << endl;
	return 0;
}