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s1 = ((a / 2) / b) * 2;
s = s1 + (a - s1 * b) / b
s2 = (a / 2) / b s1 = s2 * 2 s = s1 + (a - s1 * b) / b s = s2 * 2 + (a - (s2 * b) * 2) / b