#include <stdio.h>
#include <math.h>

#define MAXLOOP 1e7

double myFun1(double x) {
  double a = sin(x);
  return a;
}

double myFun2(double x) {
  double a = pow(x,3);
  return a;
}

double myFun3(double x) {
  double a = sqrt(x);
  return a;
}

int main(int argc, char *argv[]) {
  int i;
  double x;
  double xsum = 0.0;
  for (i=1; i<MAXLOOP; i++) {
    x = myFun1(i) + myFun2(i) + myFun3(i);
    xsum += x;
  }
  printf("xsum = %.6f\n", xsum);
  return 0;
}