#include <bits/stdc++.h>
using namespace std;

int main(){
  double a,b;
  cin >> a >> b;
  a=(int)a%12;
  double x=0;
  if(a*6<1.1*b) x=(60-b)*6+a*30+b*0.5;
  else if(a*6>1.1*b) x=a*30-b*5.5;
  while(x<0) x+=360;
  while(360<x) x-=360;
  
  double p=(double)11/120;
  int ans=x/p;
  cout << ans << endl;
}