#include <stdio.h>
#include <conio.h>
#include <math.h>
int main(){

    int i,n,F1,F2;
    float F3,T;

    do {printf("Nhap vao so nguyen duong n=");
      scanf("%d",&n);}
    while(n<=0);

    for(i=1;i<n+1;i++) F1+=i;
    printf("\n S=1+2+3-...+n=%d",F1);

    for(i=1;i<n+1;i++) F2+=pow(i,i);
    printf("\n S=1^1+2^2+3^3+...+n^n=%d",F2);

    for(i=1;i<n+1;i++) F3+=1/(2*i+1);
    printf("\n S=1/3+1/5+...+1/(2n+1)=%f",F3);

    T=F1+F2+F3;
    printf("\n Yeu cau bai toan: T=",T);

    getch();

}