def count4(n):
       w = 0
       while n:
              w+=int(n%5==4)
              w//=5
       return w
max_x = 0
max4 = 0
for x in range(10,70001):
       m4 = count4(5**2025+5**400-x)
       if m4 >= max4:
              max4 = m4
              maxx = x
print(maxx)
