diff --git a/fibonacci_number_in_series.py b/fibonacci_number_in_series.py
new file mode 100644
index 00000000..0c789a57
--- /dev/null
+++ b/fibonacci_number_in_series.py
@@ -0,0 +1,22 @@
+def fib(n): 
+    phi = ((1 + (5 ** (1 / 2))) / 2); 
+    return round((phi ** n) / (5 ** (1 / 2))); 
+  
+# Function to return the required sum 
+def calculateSum(l, r): 
+      
+    # To store the sum 
+    sum = 0; 
+  
+    # Calculate the sum 
+    for i in range(l, r + 1): 
+        sum += fib(i); 
+  
+    return sum; 
+
+# Taking inputs from user
+z,x = map(int,input().split())
+# Driver Code 
+if __name__ == '__main__': 
+    l, r = 4, 8; 
+    print(calculateSum(z, x));