View Compilation Error

0_0_33172670_23131.cpp: In function 'int main()':
0_0_33172670_23131.cpp:6:5: error: '_int64' was not declared in this scope
     _int64 n,a;
     ^
0_0_33172670_23131.cpp:7:26: error: 'n' was not declared in this scope
     while(scanf("%I64d",&n)!=EOF)
                          ^
0_0_33172670_23131.cpp:9:16: error: expected ';' before 'b'
         _int64 b=0,c;
                ^
0_0_33172670_23131.cpp:12:28: error: 'a' was not declared in this scope
             scanf("%I64d",&a);
                            ^
0_0_33172670_23131.cpp:13:16: error: 'b' was not declared in this scope
             if(b==0)
                ^
0_0_33172670_23131.cpp:15:17: error: 'c' was not declared in this scope
                 c=a;
                 ^
0_0_33172670_23131.cpp:20:20: error: 'c' was not declared in this scope
                 if(c==a)
                    ^
0_0_33172670_23131.cpp:26:26: error: 'c' was not declared in this scope
         printf("%I64d\n",c);
                          ^