Forth

#include <bits/stdc++.h>
using namespace std;

int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  int x;
  cin >> x;
  cout << (x-1)*2+2 << endl;
  cout << "DUP DROP ";
  for(int i=0; i<x-1; i++) {
    if(i)
    cout << " DUP";
    else
    cout << "DUP";
  }
  for(int i=0; i<x-1; i++) {
    cout << " +";
  }

}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED