View Compilation Error

0_0_33986898_31034.cpp: In function 'll ksm(ll, ll)':
0_0_33986898_31034.cpp:7:64: error: 'mod' was not declared in this scope
 inline ll ksm(ll a,ll b){ll sum=1;while(b){if(b&1){sum=(sum*a)%mod;b--;}b/=2;a=a*a%mod;}return sum%mod;}
                                                                ^
0_0_33986898_31034.cpp:7:84: error: 'mod' was not declared in this scope
 inline ll ksm(ll a,ll b){ll sum=1;while(b){if(b&1){sum=(sum*a)%mod;b--;}b/=2;a=a*a%mod;}return sum%mod;}
                                                                                    ^
0_0_33986898_31034.cpp:7:100: error: 'mod' was not declared in this scope
 inline ll ksm(ll a,ll b){ll sum=1;while(b){if(b&1){sum=(sum*a)%mod;b--;}b/=2;a=a*a%mod;}return sum%mod;}
                                                                                                    ^