#include <stdio.h>
#include <math.h>

int main(void)
{
        int i=-1;
        int sum=0,n;
        int a[100][2];
        double length=0.0;
        double entropy=0.0;
        printf("Adja meg a bekovetkezesi valoszinusegek alapszamat!\n");
        do
        {
                i++;
                scanf("%d",&a[i][0]);
        } while(a[i][0] != 0);
        n = i;
        for(i=0; i < n; i++)
        {
                sum += a[i][0];
        }
        printf("\nAdja meg a kodszavak hosszat!\n");
        for(i=0; i < n; i++)
        {
                scanf("%d",&a[i][1]);
        }
        for(i=0; i < n; i++)
        {
                length += (((double)a[i][0]/sum)*(double)a[i][1]);
        }
        printf("\nA varhato kodhossz: %g\n",length);
        for(i=0; i < n; i++)
        {
                entropy += (((double)a[i][0]/sum) * (log10(((double)a[i][0])/sum) / log10(2.0)));
        }
        printf("\nA forras entropiaja: %g\n", ((-1)*entropy));
    return 0;
}