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#include <fstream>
using namespace std;
ifstream f("diamant.in");
ofstream g("diamant.out");
int n,m,x,d[21][21],v[5001],i,j,delta,poz;
int main()
{
f>>n>>m>>x;
delta=4410;
if(x<-4410||x>4410)
{g<<"0";
return 0;
}
poz=0;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{poz++;
v[poz]=i*j;
poz++;
v[poz]=i*j*(-1);
}
d[0][0]=1;
for(i=1;i<=poz;i++)
for(j=0;j<=x;j++)
{if(v[i]<=j)
d[i][j]=d[i-1][j]+d[i-1][j-v[i]]+1;
else d[i][j]=d[i-1][j];
}
g<<d[n][m];
return 0;
}