#include <stdio.h>
#include <stdlib.h>

/* Retorna a soma de m + m + 1 + ... + n - 1 + n */

/* n > m*/

int soma(int m, int n) {
  int somados = 0, i;
 
  for (i=m; i<=n; i++)
       somados = somados + i; 

    return somados;
}

int main() {
  int m, n, s;
  
  printf("Digite m: ");
  scanf("%d", &m);
  printf("Digite n: ");
  scanf("%d", &n);  
  s = soma(m, n);
  printf("Soma de %d a %d = %d\n", m, n, s);
  
  system("pause");
  return 0;
}