let a = 3;
let b = 3;
let c = 10;


if (a > 2){
    for (; b < c; b++)
        if (b > 3){
          for (; b < c; b++)

            if (b > 5){
                a += 2
              for (; a < b; a++)
                a += 1;
            }
            else{
                for (; c < b; a++){
                  a += 1;
                }
            }
        }else{
         switch(b){
               case 1: a = 2;
                case 2: a = 3;
                default: a = 10;
            }
        }

}else{
   for (; a < b; a++)
        a += 1;
    b = 3;
}