#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define ll long long
#define rep(i,n) for(ll i=0;i<(n);i++)
#define pll pair<ll,ll>
#define pii pair<int,int>
#define pq priority_queue
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define endl '\n'
#define ios ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define lb(c,x) distance(c.begin(),lower_bound(all(c),x))
#define ub(c,x) distance(c.begin(),upper_bound(all(c),x))

using namespace std;


int main(){
    ll a,b;
    cin >> a >> b;
    a%=12;
    ll t=3600*a+60*b;
    if(120*6*b>t) cout << (120*360-120*6*b+t)/11 << endl;
    else if(120*6*b==t) cout << 0 << endl;
    else cout << (t-6*b*120)/11 << endl;
    return 0;
}