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#include <bits/stdc++.h>
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/*
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通过了 5/10个数据
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结果： Memory Limit Exceeded
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*/
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using namespace std;
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const int N = 1e4 + 10; //矩形的数量
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int n, sum;
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bool p[N][N];
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//这里需要估算一下空间，因为int是8个bit,bool是1个bit。
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// 1e4*1e4=1e8 100000000 bit/8= 12500000 byte = 12207.03125 kb = 11.920928955078125MB
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//模拟，对于(x1,y1)->(x2,y2)内的所有单元格，都标识为已被刷过油漆
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//注意一下这里坐标与单元格的映射关系，就把每个单元格的左下角坐标认为是单元格的编号
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void paint(int x1, int y1, int x2, int y2) {
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for (int i = x1; i < x2; i++)
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for (int j = y1; j < y2; j++)
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p[i][j] = 1;
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}
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int main() {
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//加快读入
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ios::sync_with_stdio(false), cin.tie(0);
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cin >> n;
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for (int i = 0; i < n; i++) {
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int x1, y1, x2, y2;
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cin >> x1 >> y1 >> x2 >> y2;
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paint(x1, y1, x2, y2);
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}
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for (int i = 0; i < N; i++)
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for (int j = 0; j < N; j++)
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if (p[i][j]) sum++;
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cout << sum << endl;
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return 0;
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}
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