[topcoder]PackingBallsDiv2

http://community.topcoder.com/stat?c=problem_statement&pm=12995

简单题

class PackingBallsDiv2 {
public:
	int minPacks(int R, int G, int B) {
		int sum = 0;
		sum += (R / 3);
		sum += (G / 3);
		sum += (B / 3);
		R %= 3;
		G %= 3;
		B %= 3;
		while ((R > 0 || G > 0 || B > 0)) {
			sum++;
			R--;
			G--;
			B--;
		}
		return sum;
	}
};