#include <stdio.h>

int main ( )
{
    int n,k;
    scanf("%d %d",&n,&k);
    int sumA,sumB;
    int countA=0,countB=0;
    int i=1,j=1;
    double av1,av2;
    for (i=1;i<=n;i++){
        if (i%k==0){
            countA++;
            sumA+=i;
        }
    }
    av1=sumA/countA;
    for (j=1;j<=n;j++){
        if (j%k!=0){
            countB++;
            sumB+=j;
        }
    }
    av2=sumB/countB;
    printf("%f %f",av1,av2);
    
    return 0;
}