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#include <iostream>

#include <string.h>

using namespace std;

const int MAXN = 300;

int N,R;

int degree[MAXN];

int g[MAXN][MAXN];

int main(){

while( cin>>N>>R){

int a,b;

memset(degree,0,sizeof(degree));

for(int i=0; i<R; i++){

cin>>a>>b;

degree[a]++;

degree[b]++;

g[a][b]++;

g[b][a]++;

}

int not_ok = 0;

for(int i=0; i<N; i++){

if(degree[i]%2!=0){

not_ok++;

}

}

if(not_ok<=2){

cout<<"Possible"<<endl;

}else{

cout<<"Not Possible"<<endl;

}

}

return 0;

}