C++ :

#include <iostream>
using namespace std;
int main(){
	for(int a,b,c;cin>>a>>b>>c;)
	 	cout<<(a*70+b*21+c*15-1+105)%105+1<<endl;
	return 0;}

Java :

public class Main{
	 public static void main(String[] args) { 
	       java.util.Scanner in = new   java.util.Scanner(System.in);
	      while(in.hasNext()) {
	        int a = in.nextInt(); 
	        int b = in.nextInt(); 
	        int c = in.nextInt(); 
	        long sum=a*70+b*21+c*15;
	        while(sum>105) {
	    	  sum=sum-105;}
	    		  System.out.println(sum==0?105:sum);}} }