package main
     
import (
    "strconv"
)
     
func main() {
    i, err := strconv.Atoi("12345")
    if err != nil {
        panic(err)
    }
    i += 3
    println(i)
     
    s := strconv.Itoa(12345)
    s += "3"
    println(s)
}
//go/4383