include
using namespace std; int main() {
int n, ans = 0, g, a;
cin >> n >> g >> a;
int d = a;
ans = g;
for (int i = 2; i <= n; i++) {
cin >> a;
if (d + g - 1 < a) {
ans += g;
} else {
ans += (a - d);
}
d = a;
}
cout << ans;
return 0;
}
using namespace std; int main() {
int n, ans = 0, g, a;
cin >> n >> g >> a;
int d = a;
ans = g;
for (int i = 2; i <= n; i++) {
cin >> a;
if (d + g - 1 < a) {
ans += g;
} else {
ans += (a - d);
}
d = a;
}
cout << ans;
return 0;
}
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