#include <bits/stdc++.h> using namespace std; int main() { int n; cin>>n; int a,b; char j,d,c[10]; int temp = 0; for(int i = 0;i < n;i++) { cin>>a>>j>>b>>d>>c; if(c[0] == '?') { continue; } int sum = 1; int deshu = 0; for(int r = strlen(c) - 1;r >= 0;r--) { deshu += sum * (c[r] - '0'); sum *= 10; } if(j == '+' && a + b == deshu) { temp++; } else if(j == '-' && a - b == deshu) { temp++; } } cout<<temp<<endl; return 0; }