a = int(input())
b = int(input())
c = int(input())
x = int(input())

count = 0

for i in range(a + 1):
    for j in range(b + 1):
        for k in range(c + 1):
            if 500*i + 100*j + 50*k == x:
                count += 1

print(count)
