#define _USE_MATH_DEFINES

#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset
#include <cmath>		//sqrt, ceil. M_PI, pow, sin
#include <ios>			//fixed
#include <iomanip>		//setprecision
#include <sstream>		//stringstream
#include <numeric>		//gcd, assumlate
#include <random>		//randam_device
#include <limits>		//numeric_limits
#include <time.h>       //tm

using namespace std;
constexpr int64_t D_MOD = 1000000007;
constexpr int64_t F_MOD = 998244353;


inline int Calc_Age(int yy1, int mm1, int dd1, int yy2, int mm2, int dd2) {
	//年齢

	if (yy1 > yy2) {
		return -1;
	}
	else if (yy1 == yy2) {
		if (mm1 > mm2) {
			return -1;
		}
		else if (mm1 == mm2) {
			if (dd1 > dd2) {
				return -1;
			}
			else {
				return 0;
			}
		}
		else {
			return 0;
		}
	}
	else {
		if (mm1 > mm2) {
			return yy2 - yy1 - 1;
		}
		else if (mm1 == mm2) {
			if (dd1 > dd2) {
				return yy2 - yy1 - 1;
			}
			else {
				return yy2 - yy1;
			}
		}
		else {
			return yy2 - yy1;
		}
	}
	
}

int main() {

	int M, D;
	cin >> M >> D;

	int ans = Calc_Age(2000, 8, 22, 2024, M, D);
    
	cout << ans << endl;

    return 0;

}