#include<bits/stdc++.h>
using namespace std;

#define pb push_back
#define mp make_pair 
#define fr first
#define sc second
#define sz(x) x.size()
#define rep(n) for (i = 0; i < n; i++)
#define repc(m,n) for (i = m; i < n; i++)
#define all(v) v.begin(), v.end()
#define min3(a, b, c) min(a, min(b, c))
#define max3(a, b, c) max(a, max(b, c))

#define n_l '\n' 
#define dbg(...) cout << "[" << #__VA_ARGS__ << "]: "; cout << to_string(__VA_ARGS__) << endl
template <typename T, size_t N> int SIZE(const T (&t)[N]){ return N; } template<typename T> int SIZE(const T &t){ return t.size(); } string to_string(const string s, int x1=0, int x2=1e9){ return '"' + ((x1 < s.size()) ? s.substr(x1, x2-x1+1) : "") + '"'; } string to_string(const char* s) { return to_string((string) s); } string to_string(const bool b) { return (b ? "true" : "false"); } string to_string(const char c){ return string({c}); } template<size_t N> string to_string(const bitset<N> &b, int x1=0, int x2=1e9){ string t = ""; for(int __iii__ = min(x1,SIZE(b)),  __jjj__ = min(x2, SIZE(b)-1); __iii__ <= __jjj__; ++__iii__){ t += b[__iii__] + '0'; } return '"' + t + '"'; } template <typename A, typename... C> string to_string(const A (&v), int x1=0, int x2=1e9, C... coords); int l_v_l_v_l = 0, t_a_b_s = 0; template <typename A, typename B> string to_string(const pair<A, B> &p) { l_v_l_v_l++; string res = "(" + to_string(p.first) + ", " + to_string(p.second) + ")"; l_v_l_v_l--; return res; } template <typename A, typename... C> string to_string(const A (&v), int x1, int x2, C... coords) { int rnk = rank<A>::value; string tab(t_a_b_s, ' '); string res = ""; bool first = true; if(l_v_l_v_l == 0) res += n_l; res += tab + "["; x1 = min(x1, SIZE(v)), x2 = min(x2, SIZE(v)); auto l = begin(v); advance(l, x1); auto r = l; advance(r, (x2-x1) + (x2 < SIZE(v))); for (auto e = l; e != r; e = next(e)) { if (!first) { res += ", "; } first = false; l_v_l_v_l++; if(e != l){ if(rnk > 1) { res += n_l; t_a_b_s = l_v_l_v_l; }; } else{ t_a_b_s = 0; } res += to_string(*e, coords...); l_v_l_v_l--; } res += "]"; if(l_v_l_v_l == 0) res += n_l; return res; } void dbgm(){;} template<typename Heads, typename... Tails> void dbgm(Heads H, Tails... T){ cout << to_string(H) << " | "; dbgm(T...); } 
#define dbgm(...) cout << "[" << #__VA_ARGS__ << "]: "; dbgm(__VA_ARGS__); cout << endl

// Some typedef's
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair<ll, ll> ii;
typedef vector<ll> vi;
typedef vector<ii> vii;
const double PI = 1.00 * acos(-1.00);

bool sortbysec( pair<ll,ll> a, 
                pair<ll,ll> b) 
{ 
    return (a.second < b.second); 
} 
ll extendgcd(ll a,ll b,ll& x,ll& y)
{
    if(b==0)
    {
        x=1;
        y=0;
        return a;
    }
    ll x1,y1;
    ll gcd = extendgcd(b,a%b,x1,y1);
    x=y1;
    y=x1-y1*(a/b);
    return gcd;
}

void dfs(ll a[],bool vis[],ll pos,ll null,ll neg,ll n)
{
    pos=0;
    null=0;
    neg=0;
    for(ll i=1;i<n;i++)
    {
        if(a[i]-a[i-1]>0)
            pos++;
        else if(a[i]-a[i-1]==0)
            null++;
        else
            neg++;
    }
    if(pos<=n/2 and neg<=n/2)
        return;
    for(ll i=0;i<n;i++)
    {
        if(vis[i])
            continue;
        vis[i]=1;
        dfs(a,vis,pos,null,neg,n);
        if(pos<=n/2 and neg<=n/2)
            break;
        a[i]=-a[i];
        dfs(a,vis,pos,null,neg,n);
        a[i]=-a[i];
        vis[i]=0;
    }
}
vector <ll> prime_fact(ll a)
{
    vector<ll> v;
    while(a%2==0)
    {
        a/=2;
        v.push_back(2);
    }
    for(ll i=3;i<=sqrt(a);i+=2)
    {
        while(a%i==0)
        {
            a/=i;
            v.push_back(i);
        }
    }
    if(a>2)
        v.push_back(a);
    return v;
}
void addEdgeUnd(vector<ll> adj[],ll a,ll b)
{
    adj[a].push_back(b);
    adj[b].push_back(a);
}
void solve()
{
    ll n,m,i,j,k=0,ct=0;
    // cin>>n>>k;
    string s;
    cin>>s;
    // ll a[n];
    // rep(n)
    // cin>>a[i];
    i=0;
    while(i<s.size())
    {
        ct+=s[i]-'0';
        i++;
    }
    if(ct%9==0)
        cout<<"Yes";
    else
        cout<<"No";
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ll t;
    // cin>>t;
    t=1;
    ll t1=t;
    while(t--)
    {
        // cout<<"Case "<<t1-t<<": ";
        solve();
        cout<<"\n";
    }
    return 0;
}

Measured memory_bytes: 3772