#include <stdio.h>
int perfect(int num){
    int i = num / 2, sum = 0;
    while ( i ){
        if ( ! ( num % i ) )
            sum += i;
        --i;
    }
    return sum == num;
}
int main(void){
    int n;
    printf("N = ");
    scanf("%d", &n);
    while ( n ){
        if (perfect(n))
            printf("%d\n", n);
        --n;
    }
    return 0;
}