68A - Irrational problem - CodeForces Solution

from itertools import permutations as per

p1, p2, p3, p4, a, b = map(int, input().split())

p = list(per([p1, p2, p3, p4], 4))

x = 0

for i in range(a, b + 1):
	c = 0
	
	for j in p:
		if (((i % j[0]) % j[1]) % j[2]) % j[3] == i:
			c += 1
			
	if c >= 7:
		x += 1
		
print(x)