#include using namespace std; typedef long long ll; typedef pair p_ll; template void debug(T itr1, T itr2) { auto now = itr1; while(now=0; i--) const ll MOD = pow(10,9)+7; const ll LLINF = pow(2,61)-1; const int INF = pow(2,30)-1; vector fac; void c_fac(int x=pow(10,6)+10) { fac.resize(x,true); rep(i,x) fac[i] = i ? (fac[i-1]*i)%MOD : 1; } ll inv(ll a, ll m=MOD) { ll b = m, x = 1, y = 0; while (b!=0) { int d = a/b; a -= b*d; swap(a,b); x -= y*d; swap(x,y); } return (x+m)%m; } ll nck(ll n, ll k) { return fac[n]*inv(fac[k]*fac[n-k]%MOD)%MOD; } ll gcd(ll a, ll b) { if (ay%2||(x%2&&y%2&&x>y)||(!x%2&&!y%2&&x len, pre; void dfs(ll n) { if (len[n]!=INF) return; for (ll i=1; i*i<=n; i+=2) { dfs(n-i*i); if (len[n]>len[n-i*i]+i) { len[n]=len[n-i*i]+i; pre[n] = i; } } for (ll i=2; i*i<=n; i+=2) { dfs(n-i*i); if (len[n]>len[n-i*i]+i) { len[n]=len[n-i*i]+i; pre[n] = i; } } } int main() { ll N; cin >> N; len.resize(N+1,INF); len[0] = 0; pre.resize(N+1,INF); pre[0] = -1; dfs(N); ll tn = N; vector r; while (tn) { r.push_back(pre[tn]); tn -= pre[tn]*pre[tn]; } // sort(all(r),[](const ll &x, const ll &y){return b(x,y);}); vector o, e; for(auto x: r) { if (x%2) o.push_back(x); else e.push_back(x); } sort(all(o)); sort(all(e)); // debug(all(r)); debug(all(o)); debug(all(e)); string result; for (auto x: o) { rep(i,x/2) result += "01"; result += "0"; } rep(i,e.size()) { ll np = i%2==0 ? (e.size()-1)-i/2 : i/2; if (i%2==0) rep(j,e[np]/2) result += "01"; else rep(j,e[np]/2) result += "10"; } cout << result << endl; return 0; }