View Compilation Error

0_0_17787634_29771.cpp: In function 'int main()':
0_0_17787634_29771.cpp:4:2: error: '_int64' was not declared in this scope
  _int64 n,max,k;
  ^
0_0_17787634_29771.cpp:8:3: error: 'k' was not declared in this scope
   k=(_int64)i;
   ^
0_0_17787634_29771.cpp:13:24: error: 'n' was not declared in this scope
  while(~scanf("%I64d",&n)!=EOF){
                        ^
0_0_17787634_29771.cpp:15:3: error: 'max' was not declared in this scope
   max=0;
   ^