#include <bits/stdc++.h>

using namespace std;

#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define RFOR(i, a, b) for(int i = (a) - 1; i >= (b); i--)
#define SZ(a) int(a.size())
#define ALL(a) a.begin(), a.end()
#define PB push_back
#define MP make_pair
#define F first
#define S second

typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PII;
typedef double db;

int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	int x, y;
	cin >> x >> y;
	int ans = 0;
	if (y & 1)
		y--;
	while (true)
	{
		int three = min(y, 32);
		int s3 = three * 3;
		if (100 - s3 <= x * 2)
		{
			ans++;
			y -= three;
			x -= (100 - s3) / 2;
		}
		else
			break;
	}
	cout << ans << '\n';
	
	return 0;
}