import math

end = 625
i = 1 
_sum = 0 
while i < end:
	_sum = _sum + (1 / (math.sqrt(i) + math.sqrt(i + 1)))
	i += 1 

print(_sum)
d1671992b1dd46f15ec42ce5b47c9dba1d303f94
<mask token>

<mask token>
while i < end:
    _sum = _sum + 1 / (math.sqrt(i) + math.sqrt(i + 1))
    i += 1
print(_sum)

<mask token>
end = 625
i = 1
_sum = 0
while i < end:
    _sum = _sum + 1 / (math.sqrt(i) + math.sqrt(i + 1))
    i += 1
print(_sum)

import math
end = 625
i = 1
_sum = 0
while i < end:
    _sum = _sum + 1 / (math.sqrt(i) + math.sqrt(i + 1))
    i += 1
print(_sum)

import math

end = 625
i = 1 
_sum = 0 
while i < end:
	_sum = _sum + (1 / (math.sqrt(i) + math.sqrt(i + 1)))
	i += 1 

print(_sum)