diff --git a/spoj/MMASS.py b/spoj/MMASS.py
new file mode 100644
index 0000000..9f9569a
--- /dev/null
+++ b/spoj/MMASS.py
@@ -0,0 +1,21 @@
+formula = input()
+MMASS = {'H': 1, 'C': 12, 'O': 16}
+nums = [str(i) for i in range(2, 10)]
+stack = []
+
+for i in range(len(formula)):
+    if formula[i] in ['H', 'C', 'O']:
+        stack.append(MMASS[formula[i]])
+    elif formula[i] == '(':
+        stack.append('(')
+    elif formula[i] in nums:
+        item = stack.pop()
+        stack.append(item*int(formula[i]))
+    elif formula[i] == ')':
+        item = stack.pop()
+        ans = 0
+        while(item != '('):
+            ans += item
+            item = stack.pop()
+        stack.append(ans)
+print(sum(stack))
diff --git a/spoj/README.md b/spoj/README.md
index 3bfc61e..5b449fe 100644
--- a/spoj/README.md
+++ b/spoj/README.md
@@ -19,6 +19,7 @@ Name | Status | Tags | Languages
 [FCTRL](FCTRL.py) | :heavy_check_mark: | `#math` | Python
 [FCTRL2](FCTRL2.py) | :heavy_check_mark: | `#math` `#big-numbers` | Python
 [JNEXT](JNEXT.py) | :heavy_check_mark: | `#ad-hoc-1` | Python
+[MMASS](MMASS.py) | :heavy_check_mark: | `#ad-hoc-1` | Python
 [NSTEPS](NSTEPS.py) | :heavy_check_mark: | `#ad-hoc-1` | Python
 [ONP](ONP.py) | :heavy_check_mark: | `#stack` | Python
 [PRIME1](PRIME1.py) | :rocket: | `#number-theory` | Python