#include <stdio.h>
int main() 
{
    int N,sum=0;
    printf("Enter the value of N:\n");
    scanf("%d",&N);
    printf("N=%d\n",N);
    if(N<=0)
    {
        printf("N should be a positive integer.\n");
        return 1;
    }
    for(int i=1;i<=N;i+=2)
        {
           sum= sum+=i;
        }
        printf("Sum of the odd number from 1 to %d is %d\n",N,sum);
        return 0;
}