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package main
import (
"fmt"
"os"
"strconv"
"github.com/01-edu/public/go/tests/lib/is"
)
func main() {
if len(os.Args) != 2 {
fmt.Println("0")
} else {
argument, _ := strconv.Atoi(os.Args[1])
if argument < 0 {
fmt.Println("0")
} else {
result := 0
for ; argument >= 0; argument-- {
if is.Prime(argument) {
result += argument
}
}
fmt.Println(result)
}
}
}