Number Pyramid in C

NumberPyramid in C.c

#include <stdio.h>

int doseries(int inp);

int main()
{
    int input,i,j,n;
    scanf("%d",&input);
    n=doseries(input);
        printf("\n");


    for(i=input;i>0;i--)
    {
        for(j=i;j>0;j--)
        {
            if(n<10){printf("0%d ",n--);}
            else printf("%d ",n--);
        }
        printf("\n");
    }

    return 0;
}

//this series is for calculating the pyramids
doseries(int inp)
{
    int i;
    for(i=inp-1;i>0;i--)
    {
        inp=inp+i;
    }
    return inp;
}