Loops

input/code.cpp:5:20: error: two or more data types in declaration of 'solve'
 int int solve(int n) {
                    ^
input/code.cpp: In function 'int main()':
input/code.cpp:17:13: error: 'solve' was not declared in this scope
     cout << solve(i);
             ^~~~~

#include <iostream>
using namespace std;

int int solve(int n) {
    int int x = 0;
    for (int a = 1; a <= n; a++)
        for (int b = a; b <= n; b++)
            for (int c = a; c <= b; c++)
                x++;
    return x;
}

int main() {
    int i;
    cin >> i;
    cout << solve(i);
}