#include <algorithm>
#include <iostream>
#include <vector>
 
std::size_t count_123(const std::vector<int>& v)
{
	std::size_t res = 0;
 
	for (auto it = v.begin(); it != v.end(); )
	{
		it = std::find(it, v.end(), 1);
		it = std::find(it, v.end(), 2);
		it = std::find(it, v.end(), 3);
        if (it != v.end()) {
        	++res;
        }
	}
	return res;
}
 
 
int main() {
	std::cout << count_123({1,2,3,1,2,2,3}) << std::endl; // 2
	std::cout << count_123({1,2,2,2,2,2,3,1,2,3}) << std::endl; // 2
	std::cout << count_123({1, 3, 2, 3, 1}) << std::endl; // 1
}

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