#include <stdio.h>

int main() {
    int a,b,c,d;
    scanf("%d %d %d %d", &a,&b,&c,&d);
    if (d>=10) {
        printf("Impossible\n");
        return 0;
    }

    int score=0;
    int cnt=0;
    for (int i=1;;i*=2) {
        if (b>=100) {
            score+=50*i*100;
            b-=100;
        }
        else if (a!=0) {
            score+=50*i*b;
            cnt=(a>=100)?100-b:a-b;
            score+=100*i*cnt;
            b=0;
            a-=cnt;
        }
        else {
            break;
        }
    }
    printf("Possible\n%d\n", score);
    return 0;
}