Program

#include <bits/stdc++.h>

using namespace std;

//Definitions for quicker writing
#define REP(i,a,b) for (int i = a; i < b; i++)

//Typedefs for quicker writing
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pi;



int main() {
	
	ios::sync_with_stdio(0);	
    	cin.tie(0);

	// Input
	long long n;
    	cin >> n;

	//Main part
	ll cur = n;
	ll count = 0;
	vector<string> cmds;
	bool impossible = false;

	while (cur > 1){
		if(cur%2==0&& cur!=4){
			cur /= 2;
			cmds.push_back("MUL");
			count++;
		} else if(cur - 3 < 1){
			impossible = true;
			cur -= 3;
		} else{
			cur -= 3;
			cmds.push_back("ADD");
			count++;
		}
	}

	// Output 
	if(impossible){
		cout << 0 << "\n";
	} else{
		cout << count+1 << "\n";

		for(int i = cmds.size()-1; i >= 0; i--){
			cout << cmds[i] << "\n";
		}

		cout << "END" << "\n";
	}

 	return 0;
}

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

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED

Test 28

Verdict: ACCEPTED

Test 29

Verdict: ACCEPTED

Test 30

Verdict: ACCEPTED