codeforces #346 div 2 A. Round House

 1/* ***********************************************
 2Author :111qqz
 3Created Time :2016年03月30日 星期三 23时59分47秒
 4File Name :code/cf/#346/A.cpp
 5************************************************ */
 6
 7#include <cstdio>
 8#include <cstring>
 9#include <iostream>
10#include <algorithm>
11#include <vector>
12#include <queue>
13#include <set>
14#include <map>
15#include <string>
16#include <cmath>
17#include <cstdlib>
18#include <ctime>
19#define fst first
20#define sec second
21#define lson l,m,rt<<1
22#define rson m+1,r,rt<<1|1
23#define ms(a,x) memset(a,x,sizeof(a))
24typedef long long LL;
25#define pi pair < int ,int >
26#define MP make_pair
27
28using namespace std;
29const double eps = 1E-8;
30const int dx4[4]={1,0,0,-1};
31const int dy4[4]={0,-1,1,0};
32const int inf = 0x3f3f3f3f;
33int n,a,b;
34int main()
35{
36	#ifndef  ONLINE_JUDGE 
37	freopen("code/in.txt","r",stdin);
38  #endif
39	cin>>n>>a>>b;
40	a = a + b;
41	while (a<=0) a+=n;
42	while (a>n) a-=n;
43	cout<<a<<endl;
44
45  #ifndef ONLINE_JUDGE  
46  fclose(stdin);
47  #endif
48    return 0;
49}