#include <stdio.h>

int main(){
    int num;
    printf("Please Enter the Value of n : \n");
    scanf("%d", &num);

    printf("\nThe Sum of Odd Numbers from 1 to %d  = %d \n", num, getSum(num));
    return 0;
}

int getSum(int n){
    int sum=0, i;
    for (i=1; i<=n; i=i+2){
        sum = sum+i;
    }
    return sum;
}