2019 East Central NA Regional Contest

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2019-10-26 14:00 UTC

2019 East Central NA Regional Contest

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2019-10-26 19:00 UTC
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Problem F
Musical Chairs

Professor O’Dagio of the music department at Faber College has come up with a rather interesting way of selecting its department chair. All $n$ members of the music faculty line up, then the first one in line calls out an integer $k$ corresponding to the opus number of his or her favorite musical composition by Faber College’s most illustrious alumnus, composer I. M. Tondeff. The department members then “count off,” starting with the first in line and cycling back to the beginning of the line if necessary. When the count reaches $k$, that person steps out of the line and is relieved (in more than one sense!) of chairmanship duty for that year.

The next person in line then calls out his or her favorite opus number (this becomes the new value of $k$) and the count restarts at “$1$,” and continues until the next person is eliminated, and so on. When only one faculty member is left standing, this is the new department chair. To prevent cheating, everyone’s favorite number is announced in advance and no one is allowed to choose Tondeff’s Opus $1$ (the famous drinking song Rhapsody in Brew).

For instance, suppose the professors are numbered $1$ through $4$ and lined up in that order; suppose their favorite opus numbers are, respectively, opus $8$ (The Four Sneezings), opus $2$ (Concerto for Kazoo and Cigar Box Banjo), opus $4$ (The Taekwondo Rondo), and opus $2$ (again). Figure 1 shows the process by which the new chair is selected.

($1$)

($2$)

($3$)

($4$)

 

$8$

$2$

$4$

$2$

Professor ($1$) calls out “$8$” and begins counting

($1$)

($2$)

($3$)

   

$8$

$2$

$4$

 
Professor ($4$) is eliminated. Professor ($1$) (the next in line) calls out “$8$” and begins counting

($1$)

 

($3$)

 

$8$

 

$4$

 
Professor ($2$) is eliminated. Professor ($3$) (the next in line) calls out “$4$” and begins counting
   

($3$)

   
   

$4$

 
Professor ($1$) is eliminated. Professor ($3$) is the new department chair
Figure 1: Example of Selection Process

Input

The first line of input contains an integer $n$ ($2 \leq n \leq 10^4$), the number of faculty members. The next line contains $n$ integers $k_1 \ldots k_ n$ ($2 \leq k_ i \leq 10^6$ for each $i$), where $k_ i$ is the favorite opus number of professor $i$.

Output

Output the number of the new department chair.

Sample Input 1 Sample Output 1
4
8 2 4 2
3