#include <iostream>
using namespace std;

int getMinIncrease(string num) {
	int res = 0;
	for (int i = 0; i < num.length(); i++) {
		res += num[i] - '0';
	}

	res = res % 3;
	return 3 - res;
}


int findPosToChange(string num, int INC) {
	for (int i = 0; i < num.length(); i++) {
		if (num[i] != '9' && num[i] + INC <= '9') {
			return i;
		}
	}
	return num.length() - 1;
}


int main() {
	string num;
	cin >> num;

	const int INC = getMinIncrease(num);
	const int POS = findPosToChange(num, INC);

	// cout << INC << " " << POS << endl;
	if (num[POS] + INC <= '9') {
		int extra_space = (9 - (num[POS] - '0') - INC);
		num[POS] = num[POS] + INC + extra_space - (extra_space % 3);
	} else if (3 - INC != 0) {
		num[POS] -= 3 - INC;
	} else {
		num[POS] -= 3;
	}

	cout << num << endl;

	return 0;
}