import java.util.Scanner;

public class Main {
	
	public static long simulate_count(final long begin, final long end, final int init_days, final int correct){
		int days = init_days;
		long count = 0;
		
		for(long year = begin; year < end; year++){
			if(year % 400 == 0){
				days += 2;
			}else if(year % 100 == 0){
				days += 1;
			}else if(year % 4 == 0){
				days += 2;
			}else{
				days += 1;
			}
			
			days %= 7;
			
			if(days == correct){ count++; }
		}
		
		return count;
	}
	
	public static long simulate_days(final long begin, final long end, final int init_days, final int correct){
		int days = init_days;
		long count = 0;
		
		for(long year = begin; year < end; year++){
			if(year % 400 == 0){
				days += 2;
			}else if(year % 100 == 0){
				days += 1;
			}else if(year % 4 == 0){
				days += 2;
			}else{
				days += 1;
			}
			
			days %= 7;
			
			if(days == correct){ count++; }
		}
		
		return days;
	}
	
	
	
	// [year)
	public static void simulation(final int initial_days, final int correct_days, final long year, int[] nexts, long[] counts){
		int days = initial_days;
		
		long count = 0;
		for(long i = 0; i < year; i++){
			if(i % 400 == 0){
				days += 2;
			}else if(i % 100 == 0){
				days += 1;
			}else if(i % 4 == 0){
				days += 2;
			}else{
				days += 1;
			}
			
			days %= 7;
			
			if(days == correct_days){ count++; }
		}
		
		nexts[initial_days] = days;
		counts[initial_days] = count;
	}
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final long N = sc.nextLong();
		
		final int correct_days = 3;
		int days = 3;
		
		long[] counts_1   = new long[7];
		long[] counts_4   = new long[7];
		long[] counts_100 = new long[7];
		long[] counts_400 = new long[7];
		int[] nexts_1    = new int[7];
		int[] nexts_4    = new int[7];
		int[] nexts_100  = new int[7];
		int[] nexts_400  = new int[7];
		
		for(int d = 0; d < 7; d++){
			simulation(d, correct_days, 1,   nexts_1,   counts_1);
			simulation(d, correct_days, 4,   nexts_4,   counts_4);
			simulation(d, correct_days, 100, nexts_100, counts_100);
			simulation(d, correct_days, 400, nexts_400, counts_400);
		}
		
		long answer = 0;
		for(long year = 2015; year <= N; ){
			//System.out.println(year + " " + answer);
			
			if(year % 400 == 0 && ((year + 400) <= N)){
				answer += counts_400[days];
				days = nexts_400[days];
				year += 400;
			}else if(year % 100 == 0 && ((year + 100)) <= N){
				answer += counts_100[days];
				days = nexts_100[days];
				year += 100;
			}else if(year % 4 == 0 && ((year + 4) <= N)){
				answer += counts_4[days];
				days = nexts_4[days];
				year += 4;
			}else{
				answer += counts_1[days];
				days = nexts_1[days];
				year += 1;
			}
		}
		
		System.out.println(answer);
	}
	
}