#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<algorithm>
#include<vector>
#include<string.h>
#include<math.h>
#include<map>
#include<iomanip>
#include<queue>

using ll = long long;

using namespace std;

const int inf = 1e6 + 7;

/*
00:00:00 = 0
01:05:27 = 3927
02:10:54 = 7854
03:16:21 = 10837
04:21:49 = 15709
05:27:16 = 19636
06:32:43 = 23563
07:38:10 = 27490
08:43:38 = 31418
09:49:05 = 35345
10:54:32 = 39272
12:00:00 = 43200
*/

int main(){	
	int a , b;
	cin >> a >> b;
	a %= 12;
	b %= 60;
	int second = 3600*a + 60*b;
	int ans = inf;
	int array[] = {0,3927,7854,11781,15709,19636,23563,27490,31418,35345,39272,43200};
	for(int i = 0; i < 12; i++){
		int t = array[i] - second;
		if(t < 0)continue;
		ans = min(ans , t);
	}
	if(ans == inf){
		for(int i = 0; i < 12; i++){
			int t = array[i] - second + 43200;
			if(t < 0)continue;
			ans = min(ans , t);
		}
	}
	cout << ans << endl;
	
	return 0;
}