#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <ctime>
#include <cmath>
#include <algorithm>
#include <vector>
#include <queue>
#include <deque>

#define INF (1<<30)
#define mod 666013

using namespace std;
int i;
int main()
{
    //freopen("1.in", "r", stdin);
    //freopen("1.out", "w", stdout);
    printf("20\n");
    for(i=0;i<=19;i++)
        printf("%d ", 1<<i);
    return 0;
}