macroul

#include <stdio.h>

int main()
{
    char char_array[128];
    int i = 0, ch, sum = 0;

    while(true){
        ch = getchar();
        if(ch == '\n')
            break;
        sum = sum * 10 + (ch - '0');
    }

    printf("%d", sum);

    return 0;
}