#include<stdio.h>   

int main(){ 
	int n,i,c=0;
	scanf("%d",&n);
	
	
	for(i = 1;i <= n;i++){
		if( i % 3 == 2 && i % 5 == 3 && i % 7 == 2){
			c++;
		}
	}
	
	printf("%d",c);
	return 0;
} 
/**************************************************************
	Problem: 1055
	User: admin
	Language: C
	Result: Accepted
	Time:10 ms
	Memory:1144 kb
****************************************************************/