diff --git a/README.md b/README.md
index 96836a0..5775efd 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,4 @@
 ```bash
 g++ "code.cpp" -o a.out && ./a.out < input.txt && rm a.out
+cses-cli submit -c problemset -t 1640 src/CSES.\ 1640.py
 ```
\ No newline at end of file
diff --git a/src/A. Organizing SWERC.py b/src/A. Organizing SWERC.py
new file mode 100644
index 0000000..81fe1b8
--- /dev/null
+++ b/src/A. Organizing SWERC.py	
@@ -0,0 +1,22 @@
+def solve():
+    n = int(input())
+    D = {}
+    for i in range(n):
+        b, d = map(int, input().split())
+        if d in D:
+            if D[d] < b:
+                D[d] = b
+        else:
+            D[d] = b
+    tb = 0
+    for i in range(1, 11):
+        if not i in D:
+            return print("MOREPROBLEMS")
+        else:
+            tb += D[i]
+    return print(tb)
+
+t = int(input())
+
+for _ in range(t):
+    solve()
\ No newline at end of file
diff --git a/src/CSES. 1640.py b/src/CSES. 1640.py
new file mode 100644
index 0000000..35c3faa
--- /dev/null
+++ b/src/CSES. 1640.py	
@@ -0,0 +1,13 @@
+n, x = map(int, input().split())
+L = list(map(int, input().split()))
+
+def solve():
+    D = {}
+    for i in range(n):
+        if L[i] in D:
+            return print(i + 1, D[L[i]] + 1)
+        else:
+            D[x - L[i]] = i
+    return print("IMPOSSIBLE")
+
+solve()