function solution(A) {
    // write your code in JavaScript (Node.js 8.9.4)


    A.sort((a, b) => b - a);
    console.log(A);

    if(A[0] <= 0){
        return 1;
    }else{
        console.log('sasdssfdsdf');
        let arr2 = [];
        for(let i=0;i<A.length;i++){
            if(A[i] > 0){
                arr2[i] = A[i];
            }
        }
        console.log(arr2);


        if(arr2.length == 0){
            return 1;
        }else if(arr2.length == 1){
            return arr2[0]+1;
        }else{
            if(!verificaIntervalo(arr2)){
                return arr2[0]+1;
            }else{
                for(let i=0;i<arr2.length;i++){
                    if(arr2[i]-arr2[i+1]>1){
                        return arr2[i]-1;
                    }
                }
            }
        }

        return 1;
    }
}


function verificaIntervalo(B){
    let flag = false;
    if(B.length >= 2){
        for(let i=0; i<(B.length-1); i++){
            if((B[i]-B[i+1] == 1) || (B[i]-B[i+1] == 0)){
                flag = false;
            }else{
                flag = true;
                return flag;
            }
        }
    }
    console.log("verificaIntervalo: " + flag);
    return flag;
}




let menor = solution([1, 3, 6, 4, 1, 2]);
console.log(menor);