10.1
1 #include <iostream> 2 #include <fstream> 3 #include <iterator> 4 #include <vector> 5 #include <string> 6 #include <deque> 7 #include <list> 8 #include <forward_list> 9 #include <stack> 10 #include <queue> 11 #include <algorithm> 12 13 using namespace std; 14 15 int main() 16 { 17 vector<int> vec; 18 int i; 19 while (cin >> i) { 20 vec.push_back(i); 21 } 22 cout << count(vec.begin(), vec.end(), 2) << endl; 23 return 0; 24 }