/*
* Author: Arpit Bhayani
* https://arpitbhayani.me
*/
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <climits>
#include <deque>
#include <iostream>
#include <list>
#include <limits>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <vector>
#define ll long long
#define MIN(a, b) a < b ? a : b
#define MAX(a, b) a > b ? a : b
using namespace std;
int readline(char *str) {
int i = 0;
char ch;
while((ch = getchar()) != '\n') {
str[i++] = ch;
}
str[i] = '\0';
return i;
}
int main(int argc, char *argv[]) {
ll int r, c;
cin >> r >> c;
ll int m = 0;
m = ((r + 1) / 2) * 10;
if ( r & 1 ) {
cout << m - 2 - 2 * (5 - c) << endl;
}
else {
cout << m - 1 - 2 * (5 - c) << endl;
}
return 0;
}
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