import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc= new Scanner(System.in); int n=sc.nextInt(); int res=1; for (int i = 2; i*i <=n; i++) { while(n%i==0){ res=i; n/=i; } } if(n>1)res=n; System.out.println(res); } }
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