#include <iostream>
#include <fstream>
#define Nmax 45000

using namespace std;
ifstream f("diamant.in");
ofstream g("diamant.out");
int aux[2*Nmax+1], auxp[2*Nmax+1], auxm[2*Nmax+1],i,j,k,p,m,n,x,smax,val;
int *nr, *nrp, *nrm;

int main()
{
    nr=aux+Nmax;
    nrp=auxp+Nmax;
    nrm=auxm+Nmax;
    f>>n>>m>>x;
    nr[0]=1;
    smax=n*(n+1)/2*m*(m+1)/2;
    for(i=1;i<=n;i++)
    for(j=1;j<=m;j++)
    {
        val=i*j;
        for(k=smax-val;k>=-smax;k--) nrp[k+val]+=nr[k];
        for(k=-smax+val;k<=smax;k++) nrm[k-val]+=nr[k];
        for(k=-smax;k<=smax;k++) nr[k]+=nrm[k], nr[k]+=nrp[k];
    }
    if(x<=smax && x>=-smax) g<<nr[x]<<'\n';
    else g<<0<<'\n';
    return 0;
}