View Compilation Error

0_0_21723268_12478.cpp: In function 'int main()':
0_0_21723268_12478.cpp:24:33: error: 'n' was not declared in this scope
  while (scanf("%d%lld%lld%lld",&n,&d1,&d2,&a[1])!=EOF) {
                                 ^
0_0_21723268_12478.cpp:24:36: error: 'd1' was not declared in this scope
  while (scanf("%d%lld%lld%lld",&n,&d1,&d2,&a[1])!=EOF) {
                                    ^
0_0_21723268_12478.cpp:24:40: error: 'd2' was not declared in this scope
  while (scanf("%d%lld%lld%lld",&n,&d1,&d2,&a[1])!=EOF) {
                                        ^