public class ElseIf {
    public static int main() {
        int x = 75;

        if (x >= 90) {
            System.out.println("A");
        } else if (x >= 80) {
            System.out.println("B");
        } else if (x >= 70) {
            System.out.println("C");
        } else if (x >= 60) {
            System.out.println("D");
        } else {
            System.out.println("F");
        }

        int y = 50;
        if (y > 100) {
            System.out.println("Over 100");
        } else if (y > 50) {
            System.out.println("Over 50");
        } else {
            System.out.println("50 or less");
        }

        return 0;
    }
}