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line = input().split()
n = line[0]
k = int(line[1])

#removed the whole global superdigit construct, now its just a parameter of calc

def calc(superdigit, k): #added k here

    superlist = list(str(superdigit))

    temp = 0

    for i in range(len(superlist)):
        temp = (temp + int(superlist[i]))

    temp = temp * k #added this

    if (len(str(temp)) > 1):
        calc(temp, 1) #for every recursive step k=1

    else: print (temp)


    return

calc(n, k) #we take in n and k directly