#include #include #include #define NMAX 8003 using namespace std; /*ifstream fin("date.in"); ofstream fout("date.out");*/ int n; char v[NMAX]; bool check(int i); int main() { cin >> v; int i; int lg = strlen(v); int cars=0; for (i = 0; i < lg; i+=8) { if (v[i] == '1') { if (cars) { cout << "No" << '\n'; return 0; } else { int j = i + 7; while (v[j] == '0') { cars++; j--; } } //i += 8; } else { cars--; if (cars < 0) { cout << "No" << '\n'; return 0; } } } if (cars) cout << "No" << '\n'; else cout << "Yes" << '\n'; return 0; }