View Compilation Error

0_0_30353777_20304.cpp: In function 'int main()':
0_0_30353777_20304.cpp:92:9: error: 'S' was not declared in this scope
         S = 0, T = 2 * n + f + d + 1;
         ^
0_0_30353777_20304.cpp:92:16: error: 'T' was not declared in this scope
         S = 0, T = 2 * n + f + d + 1;
                ^