#include <iostream>
#include <sstream>
#include <string>
#include <ctime>

int dayOfWeek(std::string date){
	int y, m, d; char c;
    std::stringstream(date) >> y >> c >> m >> c >> d;
    std::tm t = {0,0,0,d,m-1,y-1900};
    std::mktime(&t);
    return t.tm_wday;
}

int main()
{
	std::cout << dayOfWeek("2015-11-27");
}