#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000



int main(){

	vector<vector<int>> t = {{0,0,0},{1,5,27},{2,10,54},{3,16,21},{4,21,49},{5,27,16},{6,32,43},{7,38,10},{8,43,38},{9,49,5},{10,54,32}};
	
	vector<int> S;
	
	rep(i,t.size()*10){
		S.push_back(t[i%11][0]*3600+t[i%11][1]*60+t[i%11][2]);
		rep(j,t.size()/11){
			S.back() += 3600 * 12;
		}
	}
	
	int A,B;
	cin>>A>>B;
	int C = B*60 + A*3600;
	
	cout<<(*lower_bound(S.begin(),S.end(),C)) - C<<endl;;
	
	return 0;
}