View Compilation Error

0_0_29821925_2259.cpp: In function 'int main()':
0_0_29821925_2259.cpp:57:3: error: '_int128' was not declared in this scope
   _int128 L,R=n;
   ^
0_0_29821925_2259.cpp:58:18: error: expected ')' before 'k'
   while((_int128)k*k*k<=n) k++;
                  ^
0_0_29821925_2259.cpp:58:26: error: expected ';' before ')' token
   while((_int128)k*k*k<=n) k++;
                          ^
0_0_29821925_2259.cpp:60:3: error: 'L' was not declared in this scope
   L=(_int128)k*k*k-1;
   ^
0_0_29821925_2259.cpp:63:19: error: 'R' was not declared in this scope
    ans+=(phi[i]*((R/i-L/i)%mod))%mod;
                   ^