#include <iostream>
using namespace std.
unsigned i,n,j,dea,sub;
int main()
{
cout<<"n=";
cin>>n;
for(i=0;i<n;i++)
for(j=0;j<n;j++)
{
cout<<"a["<<i<<"]["<<j<<"]=";
cin>>a[i][j];
}
for(i=1;i<n;i++)
for(j=0;j<i;j++)
sub=sub+a[i][j];
for(i=0;i<n;i++)
for(j=i+1;j<n;j++)
dea=dea+ a[i][j];
while(dea!=sub)
if(dea>sub)
dea=dea-sub;
else
sub=sub-dea;
cout<<"cmmdc este "<<dea;
return 0;
}