import collections,sys,math,functools,operator,itertools,bisect,heapq,decimal,string,time,random
#sys.setrecursionlimit(10**9)
#sys.set_int_max_str_digits(0)
#input = sys.stdin.readline

#alist = list(map(int,input().split()))
#alist = []
#s = input()
n,m = map(int,input().split())
#for i in range(n):
#    alist.append(list(map(int,input().split())))

ans = 0
for i in range(n):
    s,r = input().split()
    r = int(r)
    if r >= 1200:
        for j in range(4):
            if s[j] == 'x':
                ans += 1
                break
print(ans)