import java.io.*;
import java.util.*;


public class Main_yukicoder437 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		String s = sc.next();

		int ret = 0;
		while (s.length() >= 3) {
			// n個のビットのうち、i個のビットが立っているmaskのパターンの生成
			int n = s.length();
			int i = 3;

			int max = 0;
			int maxm = 0;
			int mask = (0x1 << i) - 1;
			while (mask < 0x1 << n) {
				// maskに対する処理

				char[] tmp = new char[3];
				int k = 0;
				for (int j = 0; j < n; j++) {
					if ((mask & 0x1 << j) != 0) {
						tmp[k++] = s.charAt(j);
					}
				}

				if (tmp[0] != '0' && tmp[0] != tmp[1] && tmp[1] == tmp[2]) {
					int cww = Integer.parseInt(new String(tmp));
					if (cww > max) {
						max = cww;
						maxm = mask;
					}
				}

				// 次のmaskの計算
				int x = mask & -mask;
				int y = mask + x;
				mask = ((mask & ~y) / x >> 1) | y;
			}

			if (max == 0) {
				break;
			} else {
				ret += max;
				for (int j = n - 1; j >= 0; j--) {
					if ((maxm & 0x1 << j) != 0) {
						s = s.substring(0, j) + s.substring(j + 1);
					}
				}
			}
		}

		pr.println(ret);
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}