#include <stdio.h>
int atoi(char s[]) {
int i, n;
n = 0;
for(i = 0; s[i] >= '0' && s[i] <= '9'; ++i)
n = 10*n + (s[i] - '0');
return n;
}
int main() {
char s[] = "jitendra";
int number = atoi(s);
printf("%d\n", number);
//printf("%d\n", atoi(s));
return 0;
}