ok so im suppose to use fibonicci number

"The sequence of integers 1,1,2,3,5,8,13....has been name the fibonacci sequence in honor of mathematician. the first two fibonacci numbers (0 and 1st) are both1; thereaftereach number in the sequence is the sum of the two preceding numbers. Write a program that prompts the user for an integer,m,then prints the mth fibonacci number."

Code:
/* Fibonacci Numbers
Daniel Latorre       
CSCI 143 */

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

int main()
   {
     int fibo,m,c;
         printf("give me m: ");
         scanf("%i",&m);
     
     if(m<0){
         printf("Enter an appropiate positive integer");
         }
     else {
         for(c=0;c<m;c++)
          {
             
             }   
             
             printf("The %i Fibonacci number is: %i",m,fibo);
i havent done much after that cause im stuck in the part of the equation.....how can i make the for loop add the sum of the previous numbers?

any help is appreciated