#include <stdio.h>
int main(void) {
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
int N,M,scarti[100000],A[100000],B[100000],i,j,k,l,temp,risposta,totale;
int adj[10000][10000];
int vertice[10000];
totale=0;
//if (M==0) scanf("%d", &risposta);
//else
//{for(i=0;i<N;i++) scanf("%d",&scarti[i]);
for(i=0;i<M;i++)
{
scanf("%d %d",&A
[i
], &B
[i
]); adj[A[i]][B[i]]=1;
adj[B[i]][A[i]]=1;
}
k=0; vertice[k]=2; for(i=0;i<7;i++) {if (adj[k][i]==1) totale++;}
return 0;
}
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