#include <stdio.h>
#include <math.h>

int main(void)
{
  
    int i, n;
    float s;
    

    printf("Enter an Integer: ");
    scanf("%d", &n); /* obtain number */
    	
    if (n>0)
    {
        for(i=1;i<=n; i++) /* cycle through 1 to n */
        {
	    s = sqrt(i); /* obtain the square root */	

            if (fmod(s,2) == 0) /* use floating point modular because sqrt returns a float */
				/* if the remainder of a division by 2 is 0, then the number is even */

		printf("%d\n", (int)i); /* print i value resulting in even square roots */
           
        }  
    } 
    else
    {
        printf("Sorry, try inputting a positive number next time.\n");
    }

return 0;
}