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220 B

package main
import (
"fmt"
"os"
"strconv"
)
func main() {
if len(os.Args) == 2 {
if i, err := strconv.Atoi(os.Args[1]); err == nil && i > 0 {
fmt.Printf("%x\n", i)
} else {
fmt.Println("ERROR")
}
}
}