console.log(1000000)
console.log(1_000_000)

console.log(1000 + 100 + 10 + 1)
console.log(1_000 + 100 + 10 + 1)

console.log(1e3 + 1e2 + 1e1 + 1)
// console.log(1_e_3 + 1e_2 + 1_e1 + 1)

console.log(10 + 1)
// console.log(1_0 + 0_1)

console.log(0b00001000 + 0b0010)
console.log(0b0000_1000 + 0b0_0_1_0)

console.log(0b10 + 0b01)
// console.log(0b_1_0 + 0b_0_1)