def gang_med_2(tall):
    return tall*2

def multipliser(a, b):
    return a*b

def potens(tall, eksponent):
    svar = 1
    for i in range(eksponent):
        svar = svar*tall
    return svar

def lag_velkomst(fag, person):
    return "Velkommen til " + fag + " kj?re " + person

a = 3
print(gang_med_2(a))
print(gang_med_2(4+5*2))
print(potens(3,4))
print(lag_velkomst("IN1000", "Per Gynt"))