C++ :

#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	cout<<a+b+c<<endl;
	return 0;
}

Python :

# coding=utf-8
a = int(input())
b = int(input())
c = int(input())
#s = format(a*4+b, '.1f')
print(a+b+c)