li=[]
for i in range (0,20):
    li.append(0)
li02 = list(map(int,input().split()))
for i in li02:

    li[i] += 1

print(max(li))
/**************************************************************
	Problem: 1180
	User: admin
	Language: Python
	Result: Accepted
	Time:101 ms
	Memory:34244 kb
****************************************************************/