c = 0
a = sorted(list(map(int,input().split())))
ar = []
for i in range(len(a)-2):
    for j in range(i+1,len(a)-1):
        for k in range(j+1,len(a)):
            if a[i]+a[j]+a[k]==0:
                ar += [str(a[i])+str(a[j])+str(a[k])]
ar = set(ar)
print(len(ar))