// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(N, S) {
    let taken = {};
    let seated = S.split(" ");
    for(let tkn of seated){
        let splittedTaken = tkn.split("");
        if(!taken[splittedTaken[0]]) {
            taken[splittedTaken[0]] = {};
        }
        taken[splittedTaken[0]][splittedTaken[1]] = true;
    }

    let counter = 0;

    for(let i=1; i<=N; i++){
        if(!taken[i]){
            taken[i] = false;
        }
        let row = ""+i;
        if(!taken[i]['B'] && !taken[i]['C'] && !taken[i]['D'] && !taken[i]['E']
            && !taken[i]['F'] && !taken[i]['G'] && !taken[i]['H'] && !taken[i]['J']){
            console.log(`add 2 for row ${i}`);
            counter+=2;
        }
        else if(!taken[i]['D'] && !taken[i]['E']
            && !taken[i]['F'] && !taken[i]['G']){
            console.log(`add 1 (0) for row ${i}`);
            counter+=1;
        }
        else if(!taken[i]['B'] && !taken[i]['C']
            && !taken[i]['D'] && !taken[i]['E']){
            console.log(`add 1 (1) for row ${i}`);
            counter+=1;
        }
        else if(!taken[i]['F'] && !taken[i]['G']
            && !taken[i]['H'] && !taken[i]['J']){
            console.log(`add 1 (2) for row ${i}`);
            counter+=1;
        }
    }

    console.log("taken", taken);

    return counter;
}

let answer = solution(2, "1D 1E");
console.log("answer", answer);