#include<cstdio>
#include<cstring> 
#include<cmath>
using namespace std;
int n;
int r[9999];
int f[99][99];
int flag[999];
int m; 
int a[99999];
int c[9999][999];
int main()
{
	//freopen("reward.in","r",stdin); 
	//freopen("reward.out","w",stdout);
	scanf("%d%d",&n,&m);
	for(int i=1;i<=m;i++)
	{
		int a,b;
		scanf("%d%d",&a,&b);
		c[b][++c[b][0]]=a;
		r[a]++;
	}
	int nn=n;
	int p=100;
	int sum=0;
	for(;nn>=1;)
	{
		int x=1;
		int t=0;
		while(x<=n)
		{
		if(r[x]==0) 
		{
		sum+=p,r[x]=999999999,nn--,a[++t]=x;	
		}
		x++;
		}	
		if(t==0) 
		{
		printf("Poor Xed");	
		return 0;
		}
		for(int j=1;j<=t;j++)
		for(int i=1;i<=c[a[j]][0];i++)
		{
			r[c[a[j]][i]]--;
		}
		p++;
	
	}
	printf("%d",sum);
	//fclose(stdin);
	//fclose(stdout); 
	return 0;
}