package main

import (
	"bufio"
	"fmt"
	"os"
    "strings"
)

func main() {
	in := bufio.NewReader(os.Stdin)
	var N,M,R,ans int
    var S string
	fmt.Fscan(in, &N,&M)
	list := make([]string,M)
    for i := 0;i < N;i++{
        fmt.Fscan(in, &S,&R)
		list = strings.Split(S, "")
        if R >= 1200 {
            for l := 0;l < 4;l++{
                if list[l] == "x"{
                    ans++
                    break
                }
            }
        }
	}

	fmt.Println(ans)
}