S = input()
r = S.count("0")
b = S.count("1")
print(min(r, b) *2) S = input() S input() input r = S.count("0") r S.count("0") S.count S count "0" b = S.count("1") b S.count("1") S.count S count "1" print(min(r, b) *2) print min(r, b) *2 min(r, b) min r b 2 S = input() input() S r = S.count("0") S.count("0") r b = S.count("1") S.count("1") b
S = input()
r = S.count("0")
b = S.count("1")
print(min(r, b) *2)