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t = int(input()) count = 0 n1 = input() n2 = input() for i in range(len(n1)): if abs(int(n1[i]) - int(n2[i])) > 5: count+= 10 - max(int(n1[i]),int(n2[i])) + min(int(n1[i]),int(n2[i])) else: count+=abs(int(n1[i]) - int(n2[i])) print(count)