reqlevel = input("Enter level: ")
if(reqlevel<=16):
    reqxp = reqlevel * 17
    print(reqxp)
else:
    if (reqlevel<=30):
        reqxp = 272
        addto = 20
        for i in range(0,(reqlevel - 16)):
            reqxp = reqxp + addto
            addto = addto + 3
        print(reqxp)
    else:
        reqxp = 272
        addto = 20
        for i in range(0,14):
            reqxp = reqxp + addto
            addto = addto + 3
        for i in range(0,(reqlevel - 30)):
            reqxp = reqxp + addto
            addto = addto + 7
        print(reqxp)