import java.io.*;
import java.util.*;

class BirthdayParadox {
	public static void main (String[] args) {
	    Scanner sc=new Scanner(System.in);


	    int n=0;
	    float num=365;
	    float den=365;
	    float p=1;
	    while(p>0.5){
	        p=p*(num/den);
	        num--;
	        n++;
	    }
		System.out.println(n);
	}
}