Hello, in short, I'm trying to solve 1999E - Тройные операции with the following solution: 276991813

While testing locally, the solution correctly returns the expected output for the sample test case, but the judge says the following: "wrong answer 4th numbers differ — expected: '263', found: '262' "

I tried some online compilers and they also return the expected output with my solution. Why is the judge returning a different output?? Any help would be appreciated, thanks.