# coding=utf-8
#打印第N个丑数
def getugly(index):
    if index<=0:
        return 0
    uglyNumber=[1]*index
    nextindex=1
    index2=0
    index3=0
    index5=0
    while nextindex<index:
        minval=min(uglyNumber[index2]*2,uglyNumber[index3]*3,uglyNumber[index5]*5)
        uglyNumber[nextindex]=minval
        while uglyNumber[index2]*2<=uglyNumber[nextindex]:
            index2+=1
        while uglyNumber[index3]*3<=uglyNumber[nextindex]:
            index3+=1
        while uglyNumber[index5]*5<=uglyNumber[nextindex]:
            index5+=1
        nextindex+=1
    return uglyNumber[-1]
if __name__ == '__main__':
    print getugly(5)