View Compilation Error

0_0_25238271_7844.cpp: In function 'LL fm(LL, LL, LL)':
0_0_25238271_7844.cpp:18:51: error: too few arguments to function 'void Mod(LL&, LL)'
 LL fm(LL a,LL b,LL p){LL r=0;for(;b;b>>=1,Mod(a+=a))if(b&1)Mod(r+=a);return r;}
                                                   ^
0_0_25238271_7844.cpp:17:6: note: declared here
 void Mod(LL &x,LL p){if(x>=p)x-=p;}
      ^
0_0_25238271_7844.cpp:18:68: error: too few arguments to function 'void Mod(LL&, LL)'
 LL fm(LL a,LL b,LL p){LL r=0;for(;b;b>>=1,Mod(a+=a))if(b&1)Mod(r+=a);return r;}
                                                                    ^
0_0_25238271_7844.cpp:17:6: note: declared here
 void Mod(LL &x,LL p){if(x>=p)x-=p;}
      ^