#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000005
#define Inf64 4000000000000000001LL

int main(){
	
	string s;
	cin>>s;
	while(true){
		int ii = -1;
		rep(i,s.size()){
			if(s[i]=='3'){
				ii = i;
				break;
			}
		}
		if(ii!=-1){
			for(int i=ii;i<s.size();i++){
				s[i] = '9';
			}
			s[ii] = '2';
			continue;
		}
		int sum = 0;
		rep(i,s.size()){
			sum += s[i]-'0';
		}
		if(sum%3!=0)break;
		for(int i=s.size()-1;i>=0;i--){
			if(s[i]=='0')s[i]='9';
			else{
				s[i]--;
				break;
			}
		}
	}
	while(s[0]=='0')s.erase(s.begin());
	cout<<s<<endl;
	return 0;
}