#include<stdio.h>
#include<conio.h>
int main()
{
int i, n;
float x, S, T;
long M;
printf("\nNhap x: ");
scanf("%f", &x);
do
{
printf("\nNhap n: ");
scanf("%d", &n);
if(n < 1)
{
printf("\n N phai >= 1. Xin nhap lai !");
}
}while(n < 1);
S = 0;
T = 1;
M = 0;
i = 1;
while(i <= n)
{
T = T * x;
M = M + i;
S = S + T/M;
i++;
}
printf("\nTong la %f", S);
getch();
return 0;
}