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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
ios_base::sync_with_stdio(false);
int n, m;
cin >> m >> n;
int smrk = 0;
int ret = 0;
for(int i = 1; i <= n; i++) {
smrk++;
if(smrk == 4) {
smrk = 1;
}
if(i > m) {
ret += smrk;
}
}
cout << ret << endl;
return 0;
}
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