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

int A,B;

double time_mod(double x){
  while(x>0)x-=360;
  while(x<0)x+=360;
  if(abs(x)<abs(x-360))return x;
  return x-360;
}

int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  cout<<fixed<<setprecision(15);

  cin>>A>>B;A%=12;

  double init_A=(double)(360*A)/12 + double(B*360)/(60*12);
  double init_B=(double)(360*B)/60;

  double now_A=init_A,now_B=init_B;

  if(time_mod(now_A-now_B)==0.0){
    cout<<0<<endl;
    return 0;
  }

  for(int s=0;s<1e6;s++){
    double diff_A=(double)(360*s)/(60*60*12);
    double diff_B=(double)(360*s)/(60*60);
    if(time_mod(now_A-now_B)*time_mod((init_A+diff_A)-(init_B+diff_B))<=0){
      cout<<s<<endl;
      return 0;
    }
    now_A=init_A+diff_A;
    now_B=init_B+diff_B;
  }
}