count = 0
f = 0
def prewin(n, k):
    return (n-1)%(k+1)!=0
for _ in range(3):
    n, k = map(int, input().split())
    if prewin(n,k):
        if f == 0:
            count += 1
            f = 0
        else:
            f = 1
    if not prewin(n, k):
        if f == 0:
            f = 1
        else:
            count += 1
            f = 0
        

print(count)