def catYears(x):
    if x == 1:
        print("1 human year is equal to 15 cat years.")
    elif x  == 2:
        print("2 human years is equal to 24 cat years.")
    elif x == 3:
        print("3 human years is equal to 28 cat years.")
    elif x == 4:
        print("4 human years is equal to 32 cat years.")
    elif x == 5:
        print("5 human years is equal to 36 cat years.")
    elif x == 6:
        print("6 human years is equal to 40 cat years.")
    elif x == 7:
        print("7 human years is equal to 44 cat years.")
    elif x == 8:
        print("8 human years is equal to 48 cat years.")
    elif x == 9:
        print("9 human years is equal to 52 cat years.")
    elif x == 10:
        print("10 human years is equal to 56 cat years.")
    elif x == 11:
        print("11 human years is equal to 60 cat years.")
    elif x == 12:
        print("12 human years is equal to 64 cat years.")
    elif x == 13:
        print("13 human years is equal to 68 cat years.")
    elif x == 14:
        print("14 human years is equal to 72 cat years.")
    elif x == 15:
        print("15 human years is equal to 76 cat years.")
    elif x == 16:
        print("16 human years is equal to 80 cat years.")
    elif x == 17:
        print("17 human years is equal to 84 cat years.")
    elif x == 18:
        print("18 human years is equal to 88 cat years.")
    elif x == 19:
        print("19 human years is equal to 92 cat years.")
    elif x == 20:
        print("20 human years is equal to 96 cat years.")
    elif x == 21:
        print("21 human years is equal to 100 cat years.")
    elif x == 22:
        print("22 human years is equal to 104 cat years.")
    elif x == 23:
        print("23 human years is equal to 108 cat years.")
    elif x == 24:
        print("24 human years is equal to 112 cat years.")
    elif x == 25:
        print("25 human years is equal to 116 cat years.")
    else:
        print("ERROR: Please enter the year with a value 1-25")