#include <cstdio>
#include <cstdlib>

int main() {
	int k, dec = 1, tmp, prev;
	bool dbl;

	while(scanf("%d", &k) == 1) {
		
		if(k % 10 == 0) {
			printf("%d\n", k + 1);
			continue;
		}
		prev = 0;
		tmp = k;
		dec = 1;
		dbl = false;
		while(tmp > 0) {
			if(tmp % 10 > 0) {
				k -= dec;
				if (prev == 1) {
					dbl = true;
					break;
				}
				prev = 1;
			} else {
				k += dec;
				if (prev == 0) {
					dbl = true;
					break;
				}
				prev = 0;
			}
			dec *= 10;
			tmp /= 10;
		}
		if (!dbl) k += 11 * dec;	
		
		/*while(k > 0) {
			res += (k % 10) * d;
			d *= -2;
			k /= 10;
			dec *= 10;
		}
		res += 1;
		k = 0;
		printf("%d\n", res);
		
		while(std::abs(d) > 0) {
			if (res / std::abs(d) > 0) {
				if (d < 0) {
					k += 11 * dec;
					res += d;
				} else {
					k += dec;
					res -= d;
				}
			}
			dec /= 10;
			d /= -2;
			printf("%d %d %d %d\n", res, k, d, dec);
		}*/
		printf("%d\n", k);
		
	}
	return 0;	
}