a,b = map(int,input().split())
sum = 0
sum1 = 0
for i in range(b+1):
    sum+=sum1
    #print(sum1)
    sum1 = 0
    for j in range(i+1):
        sum1 = sum1*10
        sum1 +=a
        j += 1
    i += 1

print(sum)