#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
using P = pair<int,int>;
const int INF = 1001001001;

int main() {
  int a, b;
  cin >> a >> b;
  int t = (a*60 + b) % (12 * 60) * 60;
  for(int i = 0; i < 12; i++){
    int x = i*12*60*60/11;
    int ans = x - t;
    if(ans>=0) {
      cout<<ans<<endl;
      break;
    }
  }
  return 0;
}