int n;
        scanf("%d",&n);
        int f=0;
        while(n!=1)
        {
            if(n%2!=0)
            {
                f=1;
            }
            n=n/2;
        }
        if(f==0) printf("YES\n");
        else printf("NO\n");

        //2.
        int n;
        scanf("%d",&n);
        if(n>=0 && n<60) printf("Fail\n");
        if(n>=60 && n<70) printf("D\n");
        if(n>=70 && n<80) printf("C\n");
        if(n>=80 && n<90) printf("B\n");
        if(n>=90 && n<=100) printf("A\n");
        if(n>=101 || n<0) printf("Invalid\n");


        //3.
        float n, x;
        scanf("%f",&n);
        if(n<0)
        {
            n=(-1)*n;
        }
        float A=ceil(n);
        int B=n;
        float C=n;
        printf("%.0f %d %.1f\n", A, B, C);

        //4.
        int n;
        scanf("%d",&n);
        int x;
        while(n!=0)
        {
            x=n%10;
            printf("%d", x);
            n/=10;
        }
        printf("\n");

        //5.
        int n, i;
        scanf("%d",&n);2
        int res=0;
        for(i=1; i<=n; i++)
        {
            res+=pow(i,2)*(i+1);
        }
        printf("Result: %d\n",res);
        1^2*2 + 2^2*3
        //6.
        int n, i;
        scanf("%d",&n);
        printf("%d! = ",n);4! =
        int sum=1;
        for(int i=n;i>=1;i--)
        {
            sum*=i;
            if(i==1) printf("%d", i);
            else printf("%d X ", i);
        }
        printf(" = %d\n", sum);


        //7.
        int i, x, y;
        scanf("%d %d",&x, &y); x=5^2 5*5
        int result=1;
        while(y>0)
        {
            if (y%2==0)
            {
                x=x*x;5*5
                y=y/2;
            }
            else // y isn't even
            {
                result=result*x;
                y=y-1;
            }
        }
        printf("%d\n", result);



        int i, x, y;
        scanf("%d %d",&x, &y);
        int gcd=__gcd(x,y);
        int lcm=(x*y)/gcd;
        printf("GCD:%d\n", gcd);
        printf("LCM:%d\n", lcm);