#include <iostream>
using namespace std;

int level = 1;
int current_line = 2;
int next_multiple_of_ten = 10;
int score = 1200;

//if current line is equal to or higher than the next multiple of then the level should increase
void level_up_check(int line){
	if(line>=next_multiple_of_ten){
		level++;
		next_multiple_of_ten = next_multiple_of_ten + 10;
	}
}

int st_stack(int max_level){
	
	int tetris_clear_counter = 1;
	while(level<max_level){
		
		//if the leftover of the tspins has gotten to 4 blocks a tetris will be performed
		if(tetris_clear_counter==4){
			score = score + (800*level*1.5);
			tetris_clear_counter = 0;
			current_line = current_line + 4;
			level_up_check(current_line);
		}
		//t-spin
		score = score + (1200*level*1.5);
		current_line = current_line + 2;
		level_up_check(current_line);
			
		tetris_clear_counter++;
	
	}
	return score;
}

int main(){
	int max_level;
    cout << "insert to what level" << endl;
	cin >> max_level;
    cout << st_stack(max_level) << endl;
	
	return 0;
}