#importing modules
import math
from __future__ import division
#Variable declaration
t=0.1*10**-2; #thickness of piezo electric crystal(m)
E=80*10**9; #Young's modulus of crystal(pa)
d=2654; #density of material of crystal(Kgm^-3)
#Calculation
f=1/(2*t)*math.sqrt(E/d); #The frequency to which a piezo electric oscillator circuit should be turned(Hz)
#Result
print "The frequency to which a piezo electric oscillator circuit should be turned is",round(f/10**6,4),"*10**6 Hz"