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代码：

import math

nEu = input()
n = int(nEu.split(' ')[0])
Eu = int(nEu.split(' ')[1])
del(nEu)
F = {}
speed = 0
for i in range(n):
    a = input().split(' ')
    s_i = int(a[0])
    k_i = int(a[1])
    v1_i = int(a[2])
    F['s_'+str(i)] = s_i
    F['k_'+str(i)] = k_i
    F['v1_'+str(i)] = s_i
    F['v_'+str(i)] = math.sqrt(k_i/v1_i)
    s += F['s_'+str(i)] * f['v_'+str(i)] / F['v1_'+str(i)]
print(s)

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