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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int a[1000], b[1000], n;
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cin >> n;
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for (int i = 0; i < n; i++) {
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cin >> a[i];
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}
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for (int i = 0; i < n; i++) {
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cin >> b[i];
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}
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int ab = 0;
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for (int i = 0; i < n; ++i) {
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ab += a[i] * b[i];
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}
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cout << ab << endl;
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return 0;
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}
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