import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n=sc.nextInt(); int sum=1;//1也是1个 for (int i = 2; i <=n; i++) { String s=i+""; if(s.contains("1")){ for (int j = 0; j < s.length(); j++) { if(s.charAt(j)=='1') sum++; } } } System.out.println(sum); } }
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