#!/usr/bin/env python3
# †
import os
from math import sqrt

###
if __name__ == '__main__':
    dat = os.read(0, 20000010).decode().split('\n')
    acc = 0
    for x in dat[1:-1]:
        acc += int(sqrt(int(x)) * 10**15)
        s = str(acc)
        print(s[:-15] + '.' + s[-15:17])