import operator as op
def ncr(n, r):
    r = min(r, n-r)
    if r == 0: return 1
    numer = reduce(op.mul, xrange(n, n-r, -1))
    denom = reduce(op.mul, xrange(1, r+1))
    return numer//denom

ans = 0
for i in range(1, 11):
	ans += ncr(10, i) * (2**(9-i+1))
print ans