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54 lines
714 B
54 lines
714 B
5 years ago
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package main
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import (
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"fmt"
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"os"
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"strconv"
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"github.com/01-edu/z01"
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)
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func isPrime(nb int) bool {
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if nb <= 0 || nb == 1 {
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return false
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}
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if nb <= 3 {
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return true
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} else if nb%2 == 0 || nb%3 == 0 {
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return false
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}
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i := 5
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for i*i <= nb {
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if nb%i == 0 || nb%(i+2) == 0 {
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return false
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}
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i = i + 6
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}
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return true
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}
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func main() {
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if len(os.Args) != 2 {
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z01.PrintRune('0')
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z01.PrintRune('\n')
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} else {
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argument, _ := strconv.Atoi(os.Args[1])
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if argument < 0 {
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z01.PrintRune('0')
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z01.PrintRune('\n')
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} else {
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result := 0
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for ; argument >= 0; argument-- {
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if isPrime(argument) == true {
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result = result + argument
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}
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}
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fmt.Println(result)
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}
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}
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}
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