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18 lines
298 B
C++
18 lines
298 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int n, a[100005];
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long long ans = 0;
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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 = 1; i < n; i++) {
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ans += max(a[i], a[i - 1]);
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}
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cout << ans << endl;
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return 0;
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}
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