View Compilation Error

0_0_33621369_288.cpp: In function 'int main()':
0_0_33621369_288.cpp:50:23: error: 'n2' was not declared in this scope
         int ans= ((ll)n2*(n2-1)*(n2-2)/6%mod+(ll)n1*n2%mod*(n2-1)/2%mod)%mod;
                       ^
0_0_33621369_288.cpp:50:50: error: 'n1' was not declared in this scope
         int ans= ((ll)n2*(n2-1)*(n2-2)/6%mod+(ll)n1*n2%mod*(n2-1)/2%mod)%mod;
                                                  ^