{"raw_statement":[{"iden":"statement","content":"计算下式对 $998244353$ 取模的值，其中 $x$ 为实数，其余参与运算的变量均为整数：\n\n$$\\sum_{n=1}^N \\sum_{m=1}^M \\sum_{k=0}^{m-1} \\lfloor \\dfrac{nk+x}{m}\\rfloor$$"},{"iden":"input","content":"输入一行，两个正整数 $N,M$ 和一个实数 $x$。"},{"iden":"output","content":"输出一行一个整数，表示答案对 $998244353$ 取模的值。"},{"iden":"note","content":"数据保证，$1\\leq N,M\\leq 500000$，$0<x\\leq 100000$，$x$ 精确到小数点后 $8$ 位小数。"}],"translated_statement":null,"sample_group":[["2 3 1 ","7"]],"show_order":[],"formal_statement":null,"simple_statement":null,"has_page_source":false}