#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() double a; using namespace std; int main(){ cout<<9.8*5<<endl; cout<<9.8*10<<endl; cout<<9.8*15<<endl; return 0; }