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21 lines
393 B
21 lines
393 B
#include <iostream>
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using namespace std;
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long findMissingNo(long arr[], long len) {
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long temp;
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temp = ((len) * (len + 1)) / 2;
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for (long i = 0; i < len - 1; i++)
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temp -= arr[i];
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return temp;
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}
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int main() {
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long n;
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cin >> n;
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long arr[n];
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for (long i = 0; i < n - 1; i++) {
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cin >> arr[i];
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}
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long missingNo = findMissingNo(arr, n);
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cout << missingNo;
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return 0;
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}
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