diff --git a/problem/P5587/P5587.cpp b/problem/P5587/P5587.cpp
new file mode 100644
index 00000000..a83cd535
--- /dev/null
+++ b/problem/P5587/P5587.cpp
@@ -0,0 +1,37 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+long long n, m, ans;
+string s[10005], r[10005], tmp;
+
+int main() {
+    while (getline(cin, tmp), tmp != "EOF") {
+        n++;
+        for (long long i = 0; i < tmp.size(); i++) {
+            if (tmp[i] == '<') {
+                if (!s[n].empty()) s[n].pop_back();
+            }
+            else {
+                s[n].push_back(tmp[i]);
+            }
+        }
+    }
+    while (getline(cin, tmp), tmp != "EOF") {
+        if (++m > n) continue;
+        for (long long i = 0; i < tmp.size(); i++) {
+            if (tmp[i] == '<') {
+                if (!r[m].empty()) r[m].pop_back();
+            }
+            else {
+                r[m].push_back(tmp[i]);
+            }
+        }
+        for (long long i = 0; i < min(r[m].size(), s[m].size()); i++) {
+            if (r[m][i] == s[m][i]) ans++;
+        }
+    }
+    cin >> m;
+    cout << (int)(ans * 60.0 / m + 0.5) << endl;
+    return 0;
+}