So I'm trying to make a countdown, but this happens

Here's my code, any help is appreciated.

#include <iostream>
#include <windows.h>


using namespace std;

int sec = 0;
int minu = 1;

void Seconds () {
	bool stay = true;
	
	while (minu > 0) {
		cout << minu << " minutes and " << sec << " seconds left!" << endl;
		
		if (sec == 0) {
			sec = 60;
			minu -= 1;	
		}
		
		Sleep (1000);
		sec -= 1;
	}
	
	if (minu == 0) {
		while (sec > 0) {
			Sleep (1000);
			cout << minu << " minutes and " << sec << " seconds left!" << endl;	
		}
		
		cout << "Time is up!" << endl;
	}
}

int main () {
	Seconds ();
	
	return 0;	
}

and yes, I am using a windows PC