inF = open('input.txt', 'r')
outF = open('output.txt', 'w')
s = inF.read().split()
n = int(s[0])
m = int(s[1])
s = s[2]

N = [0, 0]
res = 0

c = 1
was0 = False
for i in range(m + n - 1, 0 - 1, -1):
    N[int(s[i])] += 1
    if s[i] == '0':
        was0 = True
        if ((N[0] + N[1] - 1) - N[1]):
            c = ((c * (N[0] + N[1] - 1)) // ((N[0] + N[1] - 1) - N[1]))
        continue
    if (was0):
        c = ((c * (N[0] + N[1] - 1)) // N[1])
        res += c
print(str(bin(res))[2:], file = outF)
inF.close()
outF.close()