Untitled

What's wrong here? (EXC_BAD_ACCESS)
- (NSInteger) hebrewCalanderEndDay:(NSInteger)year{

NSInteger monthsElapsed = [[NSNumber numberWithLongLong:floor((235*year-234)/19.0)]integerValue];
NSInteger partsElapsed = 12084 + 13753*monthsElapsed;
NSInteger day = 29*monthsElapsed + [[NSNumber numberWithLongLong:floor(partsElapsed/25920)] integerValue];

if(((3 * (day+1))%7 <3){
  day++;
}
return day;
}