I keep getting this error and I'm not sure why : TypeError: unsupported operand type(s) for ** or pow(): 'builtin_function_or_method' and 'float'

    from math import pi,sqrt,exp
    s=2
    x=1
    m=0
    y=(1/((sqrt(2*pi))*s))*(exp**(-1./2)*((x-m)/s)**2)
    print (y)