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52 lines
689 B
52 lines
689 B
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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} |
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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 += 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) { |
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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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