Решение 1

let number = gets();

let s = number.toString();
let result = 0;
let mtplyIndex = [];
let addIndex = [];

for (let i = 0; i < s.length; i++) {
  if (s[i] != '0' && s[i] != '1') {
    mtplyIndex.push(Number(s[i]));
  } else {
    addIndex.push(Number(s[i]));
  }
}

if (mtplyIndex.length > 0) {
  result = mtplyIndex[0];
  for (let i = 1; i < mtplyIndex.length; i++) {
    result*=mtplyIndex[i];

  }
}
for (let i = 0; i < addIndex.length; i++) {
  result = result + addIndex[i];

}

print(result)

Решение 2
let number = gets();

let s = number.toString();
let result = 0;
let mtplyIndex = [];
let addIndex = [];

let arr = [];
arr.push(parseInt(s[0])*parseInt(s[1])*parseInt(s[2]));
arr.push(parseInt(s[0])+parseInt(s[1])+parseInt(s[2]));
arr.push(parseInt(s[0])*parseInt(s[1])+parseInt(s[2]));
arr.push(parseInt(s[0])+parseInt(s[1])*parseInt(s[2]));

arr.push(parseInt(s[0])*parseInt(s[2])*parseInt(s[1]));
arr.push(parseInt(s[0])+parseInt(s[2])+parseInt(s[1]));
arr.push(parseInt(s[0])*parseInt(s[2])+parseInt(s[1]));
arr.push(parseInt(s[0])+parseInt(s[2])*parseInt(s[1]));

arr.push(parseInt(s[1])*parseInt(s[0])*parseInt(s[2]));
arr.push(parseInt(s[1])+parseInt(s[0])+parseInt(s[2]));
arr.push(parseInt(s[1])*parseInt(s[0])+parseInt(s[2]));
arr.push(parseInt(s[1])+parseInt(s[0])*parseInt(s[2]));

arr.push(parseInt(s[1])*parseInt(s[2])*parseInt(s[0]));
arr.push(parseInt(s[1])+parseInt(s[2])+parseInt(s[0]));
arr.push(parseInt(s[1])*parseInt(s[2])+parseInt(s[0]));
arr.push(parseInt(s[1])+parseInt(s[2])*parseInt(s[0]));

arr.push(parseInt(s[2])*parseInt(s[0])*parseInt(s[1]));
arr.push(parseInt(s[2])+parseInt(s[0])+parseInt(s[1]));
arr.push(parseInt(s[2])*parseInt(s[0])+parseInt(s[1]));
arr.push(parseInt(s[2])+parseInt(s[0])*parseInt(s[1]));

arr.push(parseInt(s[2])*parseInt(s[1])*parseInt(s[0]));
arr.push(parseInt(s[2])+parseInt(s[1])+parseInt(s[0]));
arr.push(parseInt(s[2])*parseInt(s[1])+parseInt(s[0]));
arr.push(parseInt(s[2])+parseInt(s[1])*parseInt(s[0]));

arr.sort((a, b) => a - b);
print(arr[23])