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#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
const int N = 1e6 + 10;
LL n; //棋盘长、宽
int K; //注意这里要使用LL，使用int会有部分测试点WA，
// 原因是后面的去重返回的是LL，如果这里有int,应该是会自动降为int导致出问题。
//行数组与列数组
int r[N], c[N];
int main() {
//加快读取速度
ios::sync_with_stdio(false);
cin.tie();
//棋盘的长宽和车的个数
cin >> n >> k;
//读入车的位置
for (int i = 1; i <= k; i++) cin >> r[i] >> c[i];
//排序
sort(r + 1, r + k + 1);
sort(c + 1, c + k + 1);
//去重
LL x = unique(r + 1, r + k + 1) - r - 1;
LL y = unique(c + 1, c + k + 1) - c - 1;
printf("%lld", n * n - (n - x) * (n - y));
return 0;
}
