#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <math.h>
int main(void)
{
    int a,b,c,d,score=0,combo=0,pf=100,gr=50;
    scanf("%d %d %d %d",&a,&b,&c,&d);
    if(d>=10)
    {
        printf("Impossible");
        return 0;
    }
    while(b)
    {
        score+=gr;
        combo++;
        if(combo%100==0)
        {
            gr*=2;
            pf*=2;
        }
        b--;
    }
    while(a)
    {
        score+=pf;
        combo++;
        if(combo%100==0)
        {
            pf*=2;
        }
        a--;
    }
    printf("Possible\n%d",score);
}