Problem:
Score : 100 points

Problem Statement

There is an N-car train.

You are given an integer i. Find the value of j such that the following statement is true: "the i-th car from the front of the train is the j-th car from the back."

Constraints

1 \leq N \leq 100

1 \leq i \leq N

Input

Input is given from Standard Input in the following format:

N i

Output

Print the answer.

Sample Input 1

4 2

Sample Output 1

3

The second car from the front of a 4-car train is the third car from the back.

Sample Input 2

1 1

Sample Output 2

1

Sample Input 3

15 11

Sample Output 3

5

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<bits/stdc++.h>
using namespace std;
//#include<ext/rope>
//using namespace __gnu_cxx
//#include<ext/pb_ds/priority_queue.hpp>
//using namespace __gnu_pbds;
#define lowbit(x) (x&-x)
#define pb push_back
#define empb emplace_back
#define all(x) (x).begin(),(x).end()
#define clr(a,b) memset(a,b,sizeof(a))
#define caze(T) for(cin>>T;T;T--)
#define inf (1<<29)
#define Endl ('\n')
#define fi first
#define se second
#define db double
#define ldb long double
#define ll long long
#define pii pair<int,int>
#define pil pair<int,ll>
#define pli pair<ll,int>
#define pll pair<ll,ll>
#define ull unsigned long long
#define IOS ios::sync_with_stdio(0),cin.tie(0),cout.tie(0)
inline char nc() {
	#define SZ 1000000
	static char buf[SZ], *p1, *p2;
	return p1==p2&&(p2=(p1=buf)+fread(buf,1,SZ,stdin),p1==p2)?EOF:*p1++;
}
template<typename T>
inline int scan(T &x) {
	char c, sign=1; 
	while(!isdigit(c=nc())&&c!=EOF)if(c=='-')sign*=-1;
	if(c==EOF) return EOF;
	for(x = 0; isdigit(c); c = nc())
		x = (x<<1) + (x<<3) + (c&15);
	return x *= sign, 1;
}
template<typename T, typename...Args>
inline int scan(T &x, Args&...args) {
	return scan(x), scan(args...);
}
int main()
{IOS;
	int n,k;cin>>n>>k;
	cout<<n+1-k<<endl;
}