#include "stdafx.h"
#include <stdio.h>
#include <conio.h>

char s[256];
int count;

int _tmain(int argc, _TCHAR* argv[]){
    freopen("a.in","r",stdin);
    while(scanf("%s",s) == 1){
        if(strlen(s) <= 4){
            count++;
        }
    }
    printf("%d\n", count);
    return 0;
}