diff --git a/problem/P4445/P4445.cpp b/problem/P4445/P4445.cpp
new file mode 100644
index 00000000..d89ed420
--- /dev/null
+++ b/problem/P4445/P4445.cpp
@@ -0,0 +1,17 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    int n, a[100005];
+    long long ans=0;
+    cin >> n;
+    for(int i = 0 ; i < n ; i++) {
+        cin >> a[i];
+    }
+    for(int i = 1 ; i < n ; i++) {
+        ans += max(a[i], a[i-1]);
+    }
+    cout << ans << endl;
+    return 0;
+}