diff --git a/e019.py b/e019.py
index d7d2e35..79a355a 100644
--- a/e019.py
+++ b/e019.py
@@ -20,30 +20,31 @@ class Day:
 def is_leap_year(year):
     return (year % 100 > 0 and year % 4 == 0) or (year % 400 == 0)
 
-year = 1900
-# 1/1/1900 was a Monday
-first_day = Day.MONDAY
+def main():
+    year = 1900
+    # 1/1/1900 was a Monday
+    first_day = Day.MONDAY
 
-total = 0
-while year < 2000:
-    year = year + 1
-    # Count last year's days to advance the starting weekday
-    days = 366 if is_leap_year(year - 1) else 365
-    # List the number of days in each month for this year
-    months = [
-        31,
-        29 if is_leap_year(year) else 28,
-        31, 30, 31, 30, 31, 31, 30, 31, 30, 31
-    ]
-    first_day = (first_day + days % 7) % 7
-    sundays = 0
-    for m in range(len(months)):
-        days = sum(months[:m])
-        first_sunday = (7 - ((first_day + days % 7) % 7)) % 7 + 1
-        if first_sunday == 1:
-            total = total + 1
+    total = 0
+    while year < 2000:
+        year = year + 1
+        # Count last year's days to advance the starting weekday
+        days = 366 if is_leap_year(year - 1) else 365
+        # List the number of days in each month for this year
+        months = [
+            31,
+            29 if is_leap_year(year) else 28,
+            31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+        ]
+        first_day = (first_day + days % 7) % 7
+        sundays = 0
+        for m in range(len(months)):
+            days = sum(months[:m])
+            first_sunday = (7 - ((first_day + days % 7) % 7)) % 7 + 1
+            if first_sunday == 1:
+                total = total + 1
 
-print 'Total months beginning on Sunday from 1/1/1901 to 12/31/2000: {0}'.format(total)
+    print 'Total months beginning on Sunday from 1/1/1901 to 12/31/2000: {0}'.format(total)
 
 if __name__ == '__main__':
     main()