#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
int main() {
int n,m;
cin>>n>>m;
int ans=0;
for (int i = 0; i < m; ++i)
{
int b,t;
cin>>b>>t;
if(b==0||t==0) continue;
ans += (b!=t);
}
cout <<ans<<endl;
}
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