Python3 60分求改

a = int(input())

b = list(map(str,input().split(' ')))

f = int(0)

for i in range(a):

c = 0
m = b[i]
l = int(m[3])
for j in range(3):
    c += int(m[j])
if l - c >= 0:
    f += 1

print(f)