//余数化一法 #include <stdio.h> int main() { int n, h, m; scanf("%d%d%d", &n, &h, &m); printf("%d\n", n - m / h - (m % h + 2) % (m % h + 1)); //余数化一法: (m % h + 2) % (m % h + 1) return 0; }