Submission #2870766

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

#define ull unsigned long long
#define ll long long
#define mod 1000000007
#define fi first
#define se second
#define pb push_back
#define mkp make_pair
#define PI acos(-1.0)
const int N=1e5 + 5;
const int M=1e5 + 5;


int main()
{
	ios_base::sync_with_stdio(false);
	int a,b,c;
	cin>>a>>b>>c;
	ll k;
	cin>>k;
	if(k%2==0) cout << a-b << endl;
	else cout << b-a << endl;
		
	
		
	return 0;
}

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