Cod sursă (job #158141)

#include <fstream>
using namespace std;
ifstream fin("scv.in");
ofstream fout("scv.out");
int i,j,c,m,x,t,mi,tm,tt;
int main(){
    fin>>c>>t>>m>>x;
    fin.close();
    mi=m;
    while(tm<x){
        while(tm<min(x,c))
        tt++,tm+=m;
        if(tm+m*t+m*(c/mi)<x){
            tm=tm+(m*t-c);
            tt=t+tt;
            m=m+mi;
        }
        else{
            if ((x-tm)%m!=0)
                tt++;
            tt=tt+(x-tm)/m; tm=x;
        }
    }
    fout<<tt;
    fout.close();
    return 0;
}