#include<stdio.h>
#include<math.h>
int main()
{
    int n;
    scanf("%d", &n);
    if(n<0)
    {
        printf("Invalid input");
        return 0;
    }
    int i=1;
    while (i*i<=n)
    {
        printf("%d",i*i)<=n)
        if((i+1)* (i+1)<=n)
        printf(" ");
        i++;
    }
    return 0;
}