def ii():
    S = input()
    return map(int,S.split()) if " " in S else int(S)
def ai(N = 0):
    return [list(map(int,input().split())) for _ in range(N)] if N!= 0 else list(map(int,input().split()))
def yn(BOOL):
    print("Yes" if BOOL==1 else "No")

import sys,math,heapq,bisect

from collections import defaultdict

N,M = ii()
ans= 0

for _ in range(N):
    S,R = input().split()
    S = list(S)
    R = int(R)
    if R>=1200:
        for i in range(4):
            if S[i] == 'x':
                ans+=1
                break
print(ans)