#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using vin=vector<int>;
using vll=vector<long long>;
using vvin=vector<vector<int>>;
using vvll=vector<vector<long long>>;
using vstr=vector<string>;
using vvstr=vector<vector<string>>;
using vch=vector<char>;
using vvch=vector<vector<char>>;
using vbo=vector<bool>;
using vvbo=vector<vector<bool>>;
using vpii=vector<pair<int,int>>;
using pqsin=priority_queue<int,vector<int>,greater<int>>;
#define mp make_pair
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rep2(i,s,n) for(int i=(s);i<(int)(n);i++)
#define all(v) v.begin(),v.end()
#define decp(n) cout<<fixed<<setprecision((int)n)
const ll inf=1e9+7;
const ll INF=1e18;
const ll mod=99824453;

int main(){
    int a;double b;cin>>a>>b;
    double ans;
    if(30.0*(double)(a%12)+b/2.0>=6*b)ans=120.0*(30.0*(double)(a%12)-11.0*b/2.0)/11.0;
    else ans=(60.0-b)*60.0+60.0*60.0*(double)((a+1)%12)/11.0;
    cout<<floor(ans)<<endl;
}