{"raw_statement":[{"iden":"background","content":"对应的选择、判断题：<https://ti.luogu.com.cn/problemset/1106>"},{"iden":"statement","content":"顽皮的小明发现，下楼梯时每步可以走 $1$ 个台阶、$2$ 个台阶或 $3$ 个台阶。现在一共有 $N$ 个台阶，你能帮小明算算有多少种方案吗？"},{"iden":"input","content":"输入一行，包含一个整数 $N$。"},{"iden":"output","content":"输出一行一个整数表示答案。"},{"iden":"note","content":"对全部的测试点，保证 $1 \\leq N \\leq 60$。"}],"translated_statement":null,"sample_group":[["4","7"],["10","274"]],"show_order":[],"formal_statement":null,"simple_statement":null,"has_page_source":false}