View Compilation Error

0_0_31958768_5191.cpp: In function 'int main()':
0_0_31958768_5191.cpp:4:2: error: 'int64' was not declared in this scope
  int64 k,m,n;
  ^
0_0_31958768_5191.cpp:5:23: error: 'n' was not declared in this scope
  while(~scanf("%d%d",&n,&m)&&(n||m))
                       ^
0_0_31958768_5191.cpp:5:26: error: 'm' was not declared in this scope
  while(~scanf("%d%d",&n,&m)&&(n||m))
                          ^
0_0_31958768_5191.cpp:7:3: error: 'k' was not declared in this scope
   k=m+n-2;
   ^