#include <windows.h>
#include <stdio.h>

int main(void)
{
	char windir[MAX_PATH] = "", rootdrive[5] = "";
	GetWindowsDirectory(windir, MAX_PATH - 1);
	strncpy(rootdrive, windir, 3);
	printf("%s\n", rootdrive);
	getchar();
	return 0;
}