function accountBalance(argument) {
  let transactions = Number(argument.shift());
  let balance = 0;
  let counter = 0;

  while (transactions >= counter) {
    let num = Number(argument.shift());
    if (num < 0) {
      console.log(`Invalid operation!`);
      break;
    }
    balance += num;
    console.log(`Increase: ${num.toFixed(2)}`);
  }
  console.log("Total: " + balance.toFixed(2));

}
accountBalance([5, 120, 45.55, -150]);