#include<bits/stdc++.h>
using namespace std; 

int main(){
	int flag=0,sum=0;
	int week=6;
	for(int year=2000;year<=2020;year++)
	for(int month=1;month<=12;month++)
	for(int day=1;day<=31;day++){
		if(month==2){
			if((year%4==0&&year%100!=0)||year%400==0){
				if(day>29)	break;
			}else{
				if(day>28)	break;
			}
		}else if(month==1||month==3||month==5||month==7||month==8||month==10||month==12){
			if(day>31)	break;
		}else	if(day>30)	break;
	if(year==2000&&month==1&&day==1)	flag=1; //此步可以删去
		if(flag==1){ //此步可以删去
			if(week%7==1 || day==1)	sum+=2;
			else sum++;
		}
		if(year==2020&&month==10&&day==1){
			cout<<sum<<endl;
			return 0;
		}
		week++;
	}
	
}