Submission #1799585

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Source Code Expand

#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
#define ALL(A) A.begin(), A.end()

using namespace std;

typedef long long ll;
typedef pair<int, int> P;

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	int N, A, B; cin >> N >> A >> B;

	ll res = 0LL;
	if (N == 1){
		if (A != B){
			res = 0LL;
		}else{
			res = 1LL;
		} // end if
	}else{
		if (A <= B){
			res = (B - A)*(N-2LL) + 1;
		}else{
			res = 0;
		} // end if
	} // end if
	
	cout << res << endl;

	return 0;
}

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