View Compilation Error

0_0_16475818_8093.cpp: In function 'int main()':
0_0_16475818_8093.cpp:5:19: error: expected initializer before 'sum'
   unsigned _int64 sum=1;
                   ^
0_0_16475818_8093.cpp:6:19: error: expected initializer before 'mod'
   unsigned _int64 mod;
                   ^
0_0_16475818_8093.cpp:10:4: error: 'sum' was not declared in this scope
    sum*=a;
    ^
0_0_16475818_8093.cpp:11:3: error: 'mod' was not declared in this scope
   mod=sum%1000;
   ^
0_0_16475818_8093.cpp:11:7: error: 'sum' was not declared in this scope
   mod=sum%1000;
       ^