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import java.util.Scanner;
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
sc.close();
참고: https://docs.oracle.com/javase/8/docs/api/java/util/Scanner.html
Scanner (Java Platform SE 8 )
Scans the next token of the input as a float. This method will throw InputMismatchException if the next token cannot be translated into a valid float value as described below. If the translation is successful, the scanner advances past the input that match
docs.oracle.com
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