#include<stdio.h>

void run(void){
  int n,m;
  scanf("%d%d",&n,&m);

  if((n==1 && m==0)||(n==2&&m==0)||(n==3&&m==3)){
    printf("Impossible\n");
  } else {
    printf("Possible\n");
  }

  return;
}

int main(void){
  run();
  return 0;
}