import sys
 
#Time scale in us
XU = 2.0
#Voltage scale in V
YU = 0.2
#Resistor 3 resistance in ohms
R3 = 99.91
#Frequency in kHz
F = 50.0
 
#Scale is 20 units
#In calculations XU and YU are in ns and mV for unit
#Voltages are in mV and frequency is in Hz
F *= 1000
XU *= 1000 / 20
YU *= 1000 / 20
e = 0.0
for s in sys.stdin:
    if (s.strip() == ""): continue
    vlr = -1 * int(s) * YU
    pr = vlr * vlr / R3 / 1000
    e += pr
e *= XU / 1000000
print("Output power was %.3f uW" % (F * e))
 

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