#include <bits/stdc++.h>
using namespace std;
int main()
{ 
int m,n,c,d=360; 
cin>>m>>n;
c=d/12;
cout<<(n-m)*c;
 
}
/**************************************************************
	Problem: 1417
	User: chenmingyu
	Language: C++
	Result: Wrong Answer
****************************************************************/