#include using namespace std; char a[1001]; int main() { ios::sync_with_stdio(false); cin.tie(0); cout.tie(0); cin >> a; if (a[0] == '0') { cout << "No\n"; return 0; } int sz = strlen(a); int pos, cars = 0; for (int i = 0; i < sz; i += 8) { if (a[i] == '1') { if (cars) { cout << "No\n"; return 0; } pos = i + 8 - 1; while (a[pos] == '0' && pos > i) ++cars, --pos; } else if (cars <= 0) { cout << "No\n"; return 0; } else --cars; } cout << "Yes\n"; return 0; }