#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define FORR2(x,y,arr) for(auto& [x,y]:arr)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
template<class T> bool chmax(T &a, const T &b) { if(a<b){a=b;return 1;}return 0;}
template<class T> bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;}
//-------------------------------------------------------

string S;

string decdec(string A) {
	for(int i=A.size()-1;i>=0;i--) {
		if(A[i]--!='0') break;
		A[i]='9';
	}
	A=A.substr(A[0]=='0');
	if(A.empty()) A="0";
	return A;
}

void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>S;
	while(1) {
		x=0;
		FOR(i,S.size()) if(S[i]=='3') {
			S[i]='2';
			for(j=i+1;j<S.size();j++) S[j]='9';
			break;
		}
		FOR(i,S.size()) x+=S[i]-'0';
		
		if(x%3) break;
		S=decdec(S);
	}
	cout<<S<<endl;
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}