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//Variable declaration
Ef=7*1.602*10**-19; //fermi energy(J)
h=6.63*10**-34; //planck's constant
m=9.11*10**-31; //mass(kg)
//Calculation
x=h**2/(8*m);
y=(3/%pi)**(2/3);
n23=Ef/(x*y);
n=n23**(3/2); //total number of free electrons(per m**3)
//Result
printf('total number of free electrons is %0.3f **10**28 per m**3\n',(n/10**28))
printf('answer varies due to approximating off errors\n')
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