#include<iostream>
using namespace std;

int days[] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

int is_leap(int y){   //判断闰年
	return y % 400 == 0 || y % 4 == 0 && y % 100 != 0;
}

int daysOfMonth(int y, int m){
	if( m == 2)
		return is_leap(y) + 28;
	return days[m];
}

int main(){
	int y = 2000, m = 1, d = 1, w = 6;   // 年，月，日，周几
	int ans = 0; 
	while(y != 2020 || m != 10 || d != 2){
		if(d == 1 || w == 1)
			ans += 2;
		else 
			ans++;
		d++;
		if(d > daysOfMonth(y, m))
			d = 1, m++;
		if(m > 12)
			m = 1, y++;
		w++;
		if(w == 8)
			w = 1;
	}
	cout << ans << endl;
	return 0;
}