n = int(input())
arr = [input() for _ in range(n)]
pas = [arr[0]]
counts = {arr[0]:1}
for i in arr[1:]:
    if i in counts:
        counts[i] += 1
        if counts[i] == len(pas) + 1 and i not in pas:
            pas.append(i)
    else:
        counts[i] = 1
print(len(pas))