没啥营养
n = int(input())
count = 0
for i in range(1,n+1):
a = list(map(int,input().split()))
if(sum( a)/len(a))<60:
count+=1
print(count)
没啥营养
n = int(input())
count = 0
for i in range(1,n+1):
a = list(map(int,input().split()))
if(sum( a)/len(a))<60:
count+=1
print(count)