diff --git a/11.py b/11.py
new file mode 100644
index 0000000..c2a9d97
--- /dev/null
+++ b/11.py
@@ -0,0 +1,32 @@
+def f1(eps):
+    s=1
+    i=0
+    while(1):
+        for j in range(i+1):
+            fz=1
+            fm=1
+            for k in range(j+1):
+                fz*=(k+1)
+                fm*=(2*k+3)
+            if(fz/fm<eps):
+                print(s*2)
+                return
+        s+=fz/fm
+        i+=1
+
+def f2(eps):
+    s=1
+    i=1
+    while(1):
+        fz=1
+        fm=2*i+1
+        if(fz/fm<eps):
+            print(s*4)
+            return
+        if(i%2==1): s-=fz/fm
+        else: s+=fz/fm
+        i+=1 
+
+eps=float(input())
+f1(eps)
+f2(eps)
\ No newline at end of file