#include <stdio.h>

int main(void)
{
unsigned long i;
scanf("%ld",&i);
unsigned long t=1;
char s[100000];
char r[100000];
int y;
int w;
int g=0;
for(t;t<=i;t++){
	
	if(t%15==0){
		
	strcat(s,"FizzBuzz");
		
		
		
	}else if(t%3==0){
		
		
		
		strcat(s,"Fizz");
		
		
	}else if(t%5==0){
		
		
		strcat(s,"Buzz\n");
		
	}else{
		sprintf(r,"%d",t);
		strcat(s,r);
		
	}

}

w=strlen(s);
for(y=0;y<=w;y++){
	if(s[y]=='z'){
		g++;
	}
}
printf("%d",g);
return 0;
}