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- #include<bits/stdc++.h>
- using namespace std;
- long long S,S1=0,n,m,p;
- int main()
- {
- cin>>n>>m>>p;
- S=(n+1)*n*(m+1)*m/4;
- // cout<<S<<endl;
- p=p/2;
- for(int i=2;i<p;++i)
- {
- for(int j=1;j<=i-1;++j)
- {
- int x=j;
- int y=i-j;
- if(n-x+1>0&&m-y+1>0)
- {
- S-=(n-x+1)*(m-y+1);
- }
- }
- }
- cout<<S;
- }
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