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#include <bits/stdc++.h>
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using namespace std;
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long long n, a, b, he, jian;
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int main() {
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cin >> n;
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for (int i = 0; i < n; i++) {
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cin >> a >> b;
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jian = jian + a + b - 8;
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he += jian;
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}
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cout << he << endl;
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return 0;
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} |
