{"problem":{"name":"N-choice question","description":{"content":"Given integers $A$ and $B$, find $A+B$.   This is a $N$\\-choice problem; the $i$\\-th choice is $C_i$.   Print the **index** of the correct choice.","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc300_a"},"statements":[{"statement_type":"Markdown","content":"Given integers $A$ and $B$, find $A+B$.  \nThis is a $N$\\-choice problem; the $i$\\-th choice is $C_i$.  \nPrint the **index** of the correct choice.\n\n## Constraints\n\n*   All values in the input are integers.\n*   $1 \\le N \\le 300$\n*   $1 \\le A,B \\le 1000$\n*   $1 \\le C_i \\le 2000$\n*   $C_i$ are pairwise distinct. In other words, no two choices have the same value.\n*   There is exactly one $i$ such that $A+B=C_i$. In other words, there is always a unique correct choice.\n\n## Input\n\nThe input is given from Standard Input in the following format:\n\n$N$ $A$ $B$\n$C_1$ $C_2$ $\\dots$ $C_N$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc300_a","tags":[],"sample_group":[["3 125 175\n200 300 400","2\n\nWe have $125+175 = 300$.  \nThe first, second, and third choices are $200$, $300$, and $400$, respectively.  \nThus, the $2$\\-nd choice is correct, so $2$ should be printed."],["1 1 1\n2","1\n\nThe problem may be a one-choice problem."],["5 123 456\n135 246 357 468 579","5"]],"created_at":"2026-03-03 11:01:14"}}