View Compilation Error

0_0_15911219_21984.cpp: In function 'int main()':
0_0_15911219_21984.cpp:5:9: error: 'int64' was not declared in this scope
         int64 x[53];
         ^
0_0_15911219_21984.cpp:11:3: error: 'x' was not declared in this scope
   x[1]=1,x[2]=1,x[3]=2;
   ^