nums = [41, 70, 44, 50, 3]
new_num1 = int(input())
new_num2 = int(input())
nums[1] = new_num1
nums[3] = new_num2
avg = sum(nums) / len(nums)
print(avg)
bnVtcyA9IFs0MSwgNzAsIDQ0LCA1MCwgM10KCm5ld19udW0xID0gaW50KGlucHV0KCkpCm5ld19udW0yID0gaW50KGlucHV0KCkpCgpudW1zWzFdID0gbmV3X251bTEKbnVtc1szXSA9IG5ld19udW0yCgphdmcgPSBzdW0obnVtcykgLyBsZW4obnVtcykKCnByaW50KGF2Zyk=