View Compilation Error

0_0_25038135_20116.cpp: In function 'int main()':
0_0_25038135_20116.cpp:12:20: error: 'n' was not declared in this scope
 scanf("%d %d %d", &n, &m, &c);
                    ^
0_0_25038135_20116.cpp:12:24: error: 'm' was not declared in this scope
 scanf("%d %d %d", &n, &m, &c);
                        ^
0_0_25038135_20116.cpp:12:28: error: 'c' was not declared in this scope
 scanf("%d %d %d", &n, &m, &c);
                            ^