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/*Write a recursive function to convert a String into the number it represents. e.g. for input “1231” you should return integer 1231.*/

#include <iostream>

#include <cstring>

using namespace std;

int c = 0;

int convert_to_number(char* a){

if(a[0] == '\0')

return c;

c = (a[0]-'0')+c*10;

convert_to_number(a+1);

}

int main(){

char a[10000];

cin>>a;

int num = convert_to_number(a);

cout<<num;

}