diff --git a/contest/38793/T160507/T160507.cpp b/contest/38793/T160507/T160507.cpp
new file mode 100644
index 00000000..18725db7
--- /dev/null
+++ b/contest/38793/T160507/T160507.cpp
@@ -0,0 +1,14 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    int n, m, v, a, ans = 0;
+    cin >> n >> v >> m >> a;
+    for (int i = 1; i <= n; i++) {
+        ans += v;
+        if (i % m == 0) v += a;
+    }
+    cout << ans << endl;
+    return 0;
+}
diff --git a/contest/38793/T160508/T160508.cpp b/contest/38793/T160508/T160508.cpp
new file mode 100644
index 00000000..7cc4901e
--- /dev/null
+++ b/contest/38793/T160508/T160508.cpp
@@ -0,0 +1,28 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    int score;
+    double gpa = 0.0;
+    cin >> score;
+    if (score >= 90) {
+        gpa = 4.0;
+    }
+    else if (60 <= score && score <= 89) {
+        gpa = 4.0 - (90 - score) * 0.1;
+    }
+    else {
+        if (floor(sqrt(score) * 10.0) >= 90.0) {
+            gpa = 4.0;
+        }
+        else if (floor(sqrt(score) * 10.0) >= 60.0) {
+            gpa = 4.0 - (90.0 - floor(sqrt(score) * 10.0)) * 0.1;
+        }
+        else {
+            gpa = 0.0;
+        }
+    }
+    cout << fixed << setprecision(1) << gpa << endl;
+    return 0;
+}
diff --git a/contest/38793/T160509/T160509.cpp b/contest/38793/T160509/T160509.cpp
new file mode 100644
index 00000000..8f12cde8
--- /dev/null
+++ b/contest/38793/T160509/T160509.cpp
@@ -0,0 +1,26 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+struct node {
+    int i, t, k;
+} p[500005];
+
+bool cmp(node a, node b) {
+    return a.t * a.k == b.t * b.k ? a.t == b.t ? a.i < b.i : a.t > b.t : a.t * a.k > b.t * b.k;
+}
+
+int main() {
+    int n;
+    cin >> n;
+    for (int i = 1; i <= n; i++) {
+        cin >> p[i].t >> p[i].k;
+        p[i].i = i;
+    }
+    sort(p + 1, p + 1 + n, cmp);
+    for (int i = 1; i <= n; i++) {
+        cout << p[i].i << ' ';
+    }
+    cout << endl;
+    return 0;
+}