import std;

void main() {
    auto n = readln.chomp.dup;
    const len = n.length;
    while(true) {
    	const m = untriplize(n);
    	if(!isNabeatsu(m)) {
    		writeln(m);
    		return;
    	}
	    int id = -1;
	    foreach(i, c; m) {
	        if(c == '3') {
	            id = cast(int)i;
	            break;
	        }
	    }
	    if(id == -1) {
	    	if(isNabeatsu(m)) {
	    		n = (m[0..$ - 1] ~ cast(char)(m[$ - 1] - 1)).dup;
	    	} else {
	    		writeln(m);
	    		return;
	    	}
	    }
	    n = m[0..id] ~ "2" ~ "9".replicate(len - id - 1);
    }
}

char[] untriplize(const char[] n) {
	int p = 0;
    foreach(c; n) {
        const m = c - '0';
        p += m;
    }
    const d = ((((n[$ - 1] - '0') - (p % 3 == 0)) + 10) % 10) + '0';
    return (n[0..$ - 1] ~ d).dup;
}

bool isNabeatsu(const char[] s) {
	int p = 0;
	foreach(c; s) {
		p += c - '0';
	}
	return s.any!"a == '3'" || p % 3 == 0;
}